diff --git a/python/google/protobuf/pyext/map_container.cc b/python/google/protobuf/pyext/map_container.cc
index cc57d1c2c5..77c61706ff 100644
--- a/python/google/protobuf/pyext/map_container.cc
+++ b/python/google/protobuf/pyext/map_container.cc
@@ -75,7 +75,7 @@ class MapReflectionFriend {
 struct MapIterator {
   PyObject_HEAD;
 
-  std::unique_ptr<google::protobuf::MapIterator> iter;
+  std::unique_ptr<::google::protobuf::MapIterator> iter;
 
   // A pointer back to the container, so we can notice changes to the version.
   // We own a ref on this.
@@ -314,7 +314,7 @@ static MapContainer* GetMap(PyObject* obj) {
 
 Py_ssize_t MapReflectionFriend::Length(PyObject* _self) {
   MapContainer* self = GetMap(_self);
-  const Message* message = self->message;
+  const google::protobuf::Message* message = self->message;
   return message->GetReflection()->MapSize(*message,
                                            self->parent_field_descriptor);
 }
@@ -423,7 +423,7 @@ int MapContainer::Release() {
 // ScalarMap ///////////////////////////////////////////////////////////////////
 
 PyObject *NewScalarMapContainer(
-    CMessage* parent, const FieldDescriptor* parent_field_descriptor) {
+    CMessage* parent, const google::protobuf::FieldDescriptor* parent_field_descriptor) {
   if (!CheckFieldBelongsToMessage(parent_field_descriptor, parent->message)) {
     return NULL;
   }
@@ -704,7 +704,7 @@ static PyObject* GetCMessage(MessageMapContainer* self, Message* message,
 }
 
 PyObject* NewMessageMapContainer(
-    CMessage* parent, const FieldDescriptor* parent_field_descriptor,
+    CMessage* parent, const google::protobuf::FieldDescriptor* parent_field_descriptor,
     CMessageClass* message_class) {
   if (!CheckFieldBelongsToMessage(parent_field_descriptor, parent->message)) {
     return NULL;
@@ -1011,7 +1011,7 @@ PyObject* MapReflectionFriend::GetIterator(PyObject *_self) {
     Message* message = self->GetMutableMessage();
     const Reflection* reflection = message->GetReflection();
 
-    iter->iter.reset(new google::protobuf::MapIterator(
+    iter->iter.reset(new ::google::protobuf::MapIterator(
         reflection->MapBegin(message, self->parent_field_descriptor)));
   }
 
diff --git a/python/google/protobuf/pyext/message.cc b/python/google/protobuf/pyext/message.cc
index e138c93d41..2205f12fdc 100644
--- a/python/google/protobuf/pyext/message.cc
+++ b/python/google/protobuf/pyext/message.cc
@@ -171,7 +171,7 @@ static int AddDescriptors(PyObject* cls, const Descriptor* descriptor) {
   // <message descriptor>.extensions_by_name[name]
   // which was defined previously.
   for (int i = 0; i < descriptor->extension_count(); ++i) {
-    const FieldDescriptor* field = descriptor->extension(i);
+    const google::protobuf::FieldDescriptor* field = descriptor->extension(i);
     ScopedPyObjectPtr extension_field(PyFieldDescriptor_FromDescriptor(field));
     if (extension_field == NULL) {
       return -1;
@@ -2344,7 +2344,7 @@ static PyObject* RichCompare(CMessage* self, PyObject* other, int opid) {
   if (!PyObject_TypeCheck(other, CMessage_Type)) {
     equals = false;
   }
-  const Message* other_message =
+  const google::protobuf::Message* other_message =
       reinterpret_cast<CMessage*>(other)->message;
   // If messages don't have the same descriptors, they are not equal.
   if (equals &&
@@ -2352,7 +2352,7 @@ static PyObject* RichCompare(CMessage* self, PyObject* other, int opid) {
     equals = false;
   }
   // Check the message contents.
-  if (equals && !util::MessageDifferencer::Equals(
+  if (equals && !google::protobuf::util::MessageDifferencer::Equals(
           *self->message,
           *reinterpret_cast<CMessage*>(other)->message)) {
     equals = false;
diff --git a/src/google/protobuf/any.pb.h b/src/google/protobuf/any.pb.h
index 60d2e4cc49..a5ad5827f2 100644
--- a/src/google/protobuf/any.pb.h
+++ b/src/google/protobuf/any.pb.h
@@ -138,7 +138,7 @@ class LIBPROTOBUF_EXPORT Any : public ::google::protobuf::Message /* @@protoc_in
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/api.pb.h b/src/google/protobuf/api.pb.h
index cea0ffe13d..5af8aaf237 100644
--- a/src/google/protobuf/api.pb.h
+++ b/src/google/protobuf/api.pb.h
@@ -132,7 +132,7 @@ class LIBPROTOBUF_EXPORT Api : public ::google::protobuf::Message /* @@protoc_in
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -322,7 +322,7 @@ class LIBPROTOBUF_EXPORT Method : public ::google::protobuf::Message /* @@protoc
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -505,7 +505,7 @@ class LIBPROTOBUF_EXPORT Mixin : public ::google::protobuf::Message /* @@protoc_
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/compiler/command_line_interface.h b/src/google/protobuf/compiler/command_line_interface.h
index acd2f84a02..8dba994961 100644
--- a/src/google/protobuf/compiler/command_line_interface.h
+++ b/src/google/protobuf/compiler/command_line_interface.h
@@ -73,10 +73,10 @@ class DiskSourceTree;    // importer.h
 // then write a main() procedure like this:
 //
 //   int main(int argc, char* argv[]) {
-//     proto2::compiler::CommandLineInterface cli;
+//     google::protobuf::compiler::CommandLineInterface cli;
 //
 //     // Support generation of C++ source and headers.
-//     proto2::compiler::cpp::CppGenerator cpp_generator;
+//     google::protobuf::compiler::cpp::CppGenerator cpp_generator;
 //     cli.RegisterGenerator("--cpp_out", &cpp_generator,
 //       "Generate C++ source and header.");
 //
diff --git a/src/google/protobuf/compiler/cpp/cpp_helpers.cc b/src/google/protobuf/compiler/cpp/cpp_helpers.cc
index e565a0c50e..bc0a9264ad 100644
--- a/src/google/protobuf/compiler/cpp/cpp_helpers.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_helpers.cc
@@ -1324,7 +1324,7 @@ void GenerateCaseBody(internal::WireFormatLite::WireType wiretype,
                 format(
                     "object = "
                     "CastToBase(&msg->$1$_)->AddWeak(reinterpret_cast<const "
-                    "::proto2::MessageLite*>(&$2$::_$3$_default_instance_));\n",
+                    "::google::protobuf::MessageLite*>(&$2$::_$3$_default_instance_));\n",
                     FieldName(field), Namespace(field->message_type()),
                     ClassName(field->message_type()));
               }
diff --git a/src/google/protobuf/compiler/cpp/cpp_helpers.h b/src/google/protobuf/compiler/cpp/cpp_helpers.h
index 98cd9c5738..c01329fa2a 100644
--- a/src/google/protobuf/compiler/cpp/cpp_helpers.h
+++ b/src/google/protobuf/compiler/cpp/cpp_helpers.h
@@ -135,7 +135,7 @@ string DefaultInstanceName(const Descriptor* descriptor);
 // fields.
 string ReferenceFunctionName(const Descriptor* descriptor);
 
-// Name of the base class: proto2::Message or proto2::MessageLite.
+// Name of the base class: google::protobuf::Message or google::protobuf::MessageLite.
 string SuperClassName(const Descriptor* descriptor, const Options& options);
 
 // Get the (unqualified) name that should be used for this field in C++ code.
diff --git a/src/google/protobuf/compiler/cpp/cpp_message.cc b/src/google/protobuf/compiler/cpp/cpp_message.cc
index 5e9e1a6d49..e219d78432 100644
--- a/src/google/protobuf/compiler/cpp/cpp_message.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_message.cc
@@ -941,7 +941,7 @@ void MessageGenerator::GenerateClassDefinition(io::Printer* printer) {
         "public:\n"
         "#if $GOOGLE_PROTOBUF$_ENABLE_EXPERIMENTAL_PARSER\n"
         "  static const char* _InternalParse(const char* begin, const char* "
-        "end, void* object, ::proto2::internal::ParseContext* ctx);\n"
+        "end, void* object, ::$proto_ns$::internal::ParseContext* ctx);\n"
         "#endif  // $GOOGLE_PROTOBUF$_ENABLE_EXPERIMENTAL_PARSER\n"
         "  typedef ::$proto_ns$::internal::MapEntry$lite$<$classname$, \n"
         "    $key_cpp$, $val_cpp$,\n"
@@ -1158,7 +1158,7 @@ void MessageGenerator::GenerateClassDefinition(io::Printer* printer) {
         "size_t ByteSizeLong() const final;\n"
         "#if $GOOGLE_PROTOBUF$_ENABLE_EXPERIMENTAL_PARSER\n"
         "static const char* _InternalParse(const char* begin, const char* end, "
-        "void* object, ::proto2::internal::ParseContext* ctx);\n"
+        "void* object, ::$proto_ns$::internal::ParseContext* ctx);\n"
         "::$proto_ns$::internal::ParseFunc _ParseFunc() const final { return "
         "_InternalParse; }\n"
         "#else\n"
@@ -1170,7 +1170,8 @@ void MessageGenerator::GenerateClassDefinition(io::Printer* printer) {
       format(
           "#if $GOOGLE_PROTOBUF$_ENABLE_EXPERIMENTAL_PARSER\n"
           "static const char* InternalParseMessageSetItem(const char* begin, "
-          "const char* end, void* object, ::proto2::internal::ParseContext* "
+          "const char* end, void* object, "
+          "::$proto_ns$::internal::ParseContext* "
           "ctx);\n"
           "#endif  // $GOOGLE_PROTOBUF$_ENABLE_EXPERIMENTAL_PARSER\n");
     }
@@ -1879,7 +1880,7 @@ void MessageGenerator::GenerateClassMethods(io::Printer* printer) {
     format(
         "#if $GOOGLE_PROTOBUF$_ENABLE_EXPERIMENTAL_PARSER\n"
         "const char* $classname$::_InternalParse(const char* begin, const "
-        "char* end, void* object, ::proto2::internal::ParseContext* ctx) { "
+        "char* end, void* object, ::$proto_ns$::internal::ParseContext* ctx) { "
         "return end; }\n"
         "#endif  // $GOOGLE_PROTOBUF$_ENABLE_EXPERIMENTAL_PARSER\n");
     format("\n");
diff --git a/src/google/protobuf/compiler/cpp/cpp_message_field.cc b/src/google/protobuf/compiler/cpp/cpp_message_field.cc
index 0bbf35b2e3..afb272730d 100644
--- a/src/google/protobuf/compiler/cpp/cpp_message_field.cc
+++ b/src/google/protobuf/compiler/cpp/cpp_message_field.cc
@@ -48,7 +48,7 @@ namespace {
 // When we are generating code for implicit weak fields, we need to insert some
 // additional casts. These functions return the casted expression if
 // implicit_weak_field is true but otherwise return the original expression.
-// Ordinarily a static_cast is enough to cast proto2::MessageLite* to a class
+// Ordinarily a static_cast is enough to cast google::protobuf::MessageLite* to a class
 // deriving from it, but we need a reinterpret_cast in cases where the generated
 // message is forward-declared but its full definition is not visible.
 string StaticCast(const string& type, const string& expression,
diff --git a/src/google/protobuf/compiler/cpp/cpp_unittest.h b/src/google/protobuf/compiler/cpp/cpp_unittest.h
index d2dcf0a527..c5dc767ae5 100644
--- a/src/google/protobuf/compiler/cpp/cpp_unittest.h
+++ b/src/google/protobuf/compiler/cpp/cpp_unittest.h
@@ -28,14 +28,14 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// This header declares the namespace proto2::protobuf_unittest in order to expose
+// This header declares the namespace google::protobuf::protobuf_unittest in order to expose
 // any problems with the generated class names. We use this header to ensure
 // unittest.cc will declare the namespace prior to other includes, while obeying
 // normal include ordering.
 //
 // When generating a class name of "foo.Bar" we must ensure we prefix the class
-// name with "::", in case the namespace proto2::foo exists. We intentionally
-// trigger that case here by declaring proto2::protobuf_unittest.
+// name with "::", in case the namespace google::protobuf::foo exists. We intentionally
+// trigger that case here by declaring google::protobuf::protobuf_unittest.
 //
 // See ClassName in helpers.h for more details.
 
diff --git a/src/google/protobuf/compiler/cpp/cpp_unittest.inc b/src/google/protobuf/compiler/cpp/cpp_unittest.inc
index bb37b4ac02..0604731f09 100644
--- a/src/google/protobuf/compiler/cpp/cpp_unittest.inc
+++ b/src/google/protobuf/compiler/cpp/cpp_unittest.inc
@@ -105,7 +105,7 @@ class MockErrorCollector : public MultiFileErrorCollector {
 #ifndef PROTOBUF_TEST_NO_DESCRIPTORS
 
 // Test that generated code has proper descriptors:
-// Parse a descriptor directly (using proto2::compiler::Importer) and
+// Parse a descriptor directly (using google::protobuf::compiler::Importer) and
 // compare it to the one that was produced by generated code.
 TEST(GENERATED_DESCRIPTOR_TEST_NAME, IdenticalDescriptors) {
   const FileDescriptor* generated_descriptor =
diff --git a/src/google/protobuf/compiler/package_info.h b/src/google/protobuf/compiler/package_info.h
index 405e21fa5f..105ef601a5 100644
--- a/src/google/protobuf/compiler/package_info.h
+++ b/src/google/protobuf/compiler/package_info.h
@@ -32,7 +32,7 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 //
-// This file exists solely to document the proto2::compiler namespace.
+// This file exists solely to document the google::protobuf::compiler namespace.
 // It is not compiled into anything, but it may be read by an automated
 // documentation generator.
 
diff --git a/src/google/protobuf/compiler/plugin.pb.h b/src/google/protobuf/compiler/plugin.pb.h
index 55569b5ece..4b7527e5c9 100644
--- a/src/google/protobuf/compiler/plugin.pb.h
+++ b/src/google/protobuf/compiler/plugin.pb.h
@@ -151,7 +151,7 @@ class LIBPROTOC_EXPORT Version : public ::google::protobuf::Message /* @@protoc_
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -303,7 +303,7 @@ class LIBPROTOC_EXPORT CodeGeneratorRequest : public ::google::protobuf::Message
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -477,7 +477,7 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse_File : public ::google::protobuf::M
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -637,7 +637,7 @@ class LIBPROTOC_EXPORT CodeGeneratorResponse : public ::google::protobuf::Messag
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/descriptor.pb.h b/src/google/protobuf/descriptor.pb.h
index 99d66d0011..3459a073c4 100644
--- a/src/google/protobuf/descriptor.pb.h
+++ b/src/google/protobuf/descriptor.pb.h
@@ -376,7 +376,7 @@ class LIBPROTOBUF_EXPORT FileDescriptorSet : public ::google::protobuf::Message
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -516,7 +516,7 @@ class LIBPROTOBUF_EXPORT FileDescriptorProto : public ::google::protobuf::Messag
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -845,7 +845,7 @@ class LIBPROTOBUF_EXPORT DescriptorProto_ExtensionRange : public ::google::proto
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -1001,7 +1001,7 @@ class LIBPROTOBUF_EXPORT DescriptorProto_ReservedRange : public ::google::protob
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -1144,7 +1144,7 @@ class LIBPROTOBUF_EXPORT DescriptorProto : public ::google::protobuf::Message /*
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -1426,7 +1426,7 @@ class LIBPROTOBUF_EXPORT ExtensionRangeOptions : public ::google::protobuf::Mess
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -1569,7 +1569,7 @@ class LIBPROTOBUF_EXPORT FieldDescriptorProto : public ::google::protobuf::Messa
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -1952,7 +1952,7 @@ class LIBPROTOBUF_EXPORT OneofDescriptorProto : public ::google::protobuf::Messa
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -2117,7 +2117,7 @@ class LIBPROTOBUF_EXPORT EnumDescriptorProto_EnumReservedRange : public ::google
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -2260,7 +2260,7 @@ class LIBPROTOBUF_EXPORT EnumDescriptorProto : public ::google::protobuf::Messag
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -2476,7 +2476,7 @@ class LIBPROTOBUF_EXPORT EnumValueDescriptorProto : public ::google::protobuf::M
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -2649,7 +2649,7 @@ class LIBPROTOBUF_EXPORT ServiceDescriptorProto : public ::google::protobuf::Mes
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -2827,7 +2827,7 @@ class LIBPROTOBUF_EXPORT MethodDescriptorProto : public ::google::protobuf::Mess
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -3058,7 +3058,7 @@ class LIBPROTOBUF_EXPORT FileOptions : public ::google::protobuf::Message /* @@p
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -3559,7 +3559,7 @@ class LIBPROTOBUF_EXPORT MessageOptions : public ::google::protobuf::Message /*
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -3734,7 +3734,7 @@ class LIBPROTOBUF_EXPORT FieldOptions : public ::google::protobuf::Message /* @@
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -3981,7 +3981,7 @@ class LIBPROTOBUF_EXPORT OneofOptions : public ::google::protobuf::Message /* @@
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -4124,7 +4124,7 @@ class LIBPROTOBUF_EXPORT EnumOptions : public ::google::protobuf::Message /* @@p
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -4283,7 +4283,7 @@ class LIBPROTOBUF_EXPORT EnumValueOptions : public ::google::protobuf::Message /
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -4434,7 +4434,7 @@ class LIBPROTOBUF_EXPORT ServiceOptions : public ::google::protobuf::Message /*
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -4585,7 +4585,7 @@ class LIBPROTOBUF_EXPORT MethodOptions : public ::google::protobuf::Message /* @
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -4772,7 +4772,7 @@ class LIBPROTOBUF_EXPORT UninterpretedOption_NamePart : public ::google::protobu
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -4935,7 +4935,7 @@ class LIBPROTOBUF_EXPORT UninterpretedOption : public ::google::protobuf::Messag
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -5176,7 +5176,7 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo_Location : public ::google::protobuf::Me
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -5404,7 +5404,7 @@ class LIBPROTOBUF_EXPORT SourceCodeInfo : public ::google::protobuf::Message /*
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -5546,7 +5546,7 @@ class LIBPROTOBUF_EXPORT GeneratedCodeInfo_Annotation : public ::google::protobu
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -5728,7 +5728,7 @@ class LIBPROTOBUF_EXPORT GeneratedCodeInfo : public ::google::protobuf::Message
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/duration.pb.h b/src/google/protobuf/duration.pb.h
index b66e343a8e..1d32e1bbbf 100644
--- a/src/google/protobuf/duration.pb.h
+++ b/src/google/protobuf/duration.pb.h
@@ -129,7 +129,7 @@ class LIBPROTOBUF_EXPORT Duration : public ::google::protobuf::Message /* @@prot
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/empty.pb.h b/src/google/protobuf/empty.pb.h
index 7d88bb920b..65f0b192f9 100644
--- a/src/google/protobuf/empty.pb.h
+++ b/src/google/protobuf/empty.pb.h
@@ -129,7 +129,7 @@ class LIBPROTOBUF_EXPORT Empty : public ::google::protobuf::Message /* @@protoc_
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/extension_set.h b/src/google/protobuf/extension_set.h
index 9f08e62e29..c22dfe07f7 100644
--- a/src/google/protobuf/extension_set.h
+++ b/src/google/protobuf/extension_set.h
@@ -1241,7 +1241,7 @@ class RepeatedMessageTypeTraits {
     // See notes above in RepeatedEnumTypeTraits::GetRepeated(): same
     // casting hack applies here, because a RepeatedPtrField<MessageLite>
     // cannot naturally become a RepeatedPtrType<Type> even though Type is
-    // presumably a message. proto2::Message goes through similar contortions
+    // presumably a message. google::protobuf::Message goes through similar contortions
     // with a reinterpret_cast<>.
     return *reinterpret_cast<const RepeatedPtrField<Type>*>(
         set.GetRawRepeatedField(number, GetDefaultRepeatedField()));
diff --git a/src/google/protobuf/field_mask.pb.h b/src/google/protobuf/field_mask.pb.h
index b46d49979b..2055e964af 100644
--- a/src/google/protobuf/field_mask.pb.h
+++ b/src/google/protobuf/field_mask.pb.h
@@ -129,7 +129,7 @@ class LIBPROTOBUF_EXPORT FieldMask : public ::google::protobuf::Message /* @@pro
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/generated_message_reflection.cc b/src/google/protobuf/generated_message_reflection.cc
index b6d773fecc..e24f03063b 100644
--- a/src/google/protobuf/generated_message_reflection.cc
+++ b/src/google/protobuf/generated_message_reflection.cc
@@ -103,7 +103,7 @@ void ReportReflectionUsageError(
     const char* method, const char* description) {
   GOOGLE_LOG(FATAL)
     << "Protocol Buffer reflection usage error:\n"
-       "  Method      : proto2::Reflection::" << method << "\n"
+       "  Method      : google::protobuf::Reflection::" << method << "\n"
        "  Message type: " << descriptor->full_name() << "\n"
        "  Field       : " << field->full_name() << "\n"
        "  Problem     : " << description;
@@ -129,7 +129,7 @@ static void ReportReflectionUsageTypeError(
     FieldDescriptor::CppType expected_type) {
   GOOGLE_LOG(FATAL)
     << "Protocol Buffer reflection usage error:\n"
-       "  Method      : proto2::Reflection::" << method << "\n"
+       "  Method      : google::protobuf::Reflection::" << method << "\n"
        "  Message type: " << descriptor->full_name() << "\n"
        "  Field       : " << field->full_name() << "\n"
        "  Problem     : Field is not the right type for this message:\n"
@@ -142,7 +142,7 @@ static void ReportReflectionUsageEnumTypeError(
     const char* method, const EnumValueDescriptor* value) {
   GOOGLE_LOG(FATAL)
     << "Protocol Buffer reflection usage error:\n"
-       "  Method      : proto2::Reflection::" << method << "\n"
+       "  Method      : google::protobuf::Reflection::" << method << "\n"
        "  Message type: " << descriptor->full_name() << "\n"
        "  Field       : " << field->full_name() << "\n"
        "  Problem     : Enum value did not match field type:\n"
diff --git a/src/google/protobuf/generated_message_reflection.h b/src/google/protobuf/generated_message_reflection.h
index 00139a9ee2..177312cf7a 100644
--- a/src/google/protobuf/generated_message_reflection.h
+++ b/src/google/protobuf/generated_message_reflection.h
@@ -138,7 +138,7 @@ class WeakFieldMap;             // weak_field_map.h
 //                  -1.
 struct ReflectionSchema {
  public:
-  // Size of a proto2::Message object of this type.
+  // Size of a google::protobuf::Message object of this type.
   uint32 GetObjectSize() const { return static_cast<uint32>(object_size_); }
 
   // Offset of a non-oneof field.  Getting a field offset is slightly more
diff --git a/src/google/protobuf/generated_message_reflection_unittest.cc b/src/google/protobuf/generated_message_reflection_unittest.cc
index 09715c5dfb..c74e4f5ee5 100644
--- a/src/google/protobuf/generated_message_reflection_unittest.cc
+++ b/src/google/protobuf/generated_message_reflection_unittest.cc
@@ -1002,7 +1002,7 @@ TEST(GeneratedMessageReflectionTest, UsageErrors) {
     reflection->GetInt32(
       message, descriptor->FindFieldByName("optional_int64")),
     "Protocol Buffer reflection usage error:\n"
-    "  Method      : proto2::Reflection::GetInt32\n"
+    "  Method      : google::protobuf::Reflection::GetInt32\n"
     "  Message type: protobuf_unittest\\.TestAllTypes\n"
     "  Field       : protobuf_unittest\\.TestAllTypes\\.optional_int64\n"
     "  Problem     : Field is not the right type for this message:\n"
@@ -1012,7 +1012,7 @@ TEST(GeneratedMessageReflectionTest, UsageErrors) {
     reflection->GetInt32(
       message, descriptor->FindFieldByName("repeated_int32")),
     "Protocol Buffer reflection usage error:\n"
-    "  Method      : proto2::Reflection::GetInt32\n"
+    "  Method      : google::protobuf::Reflection::GetInt32\n"
     "  Message type: protobuf_unittest.TestAllTypes\n"
     "  Field       : protobuf_unittest.TestAllTypes.repeated_int32\n"
     "  Problem     : Field is repeated; the method requires a singular field.");
@@ -1020,7 +1020,7 @@ TEST(GeneratedMessageReflectionTest, UsageErrors) {
     reflection->GetInt32(
       message, unittest::ForeignMessage::descriptor()->FindFieldByName("c")),
     "Protocol Buffer reflection usage error:\n"
-    "  Method      : proto2::Reflection::GetInt32\n"
+    "  Method      : google::protobuf::Reflection::GetInt32\n"
     "  Message type: protobuf_unittest.TestAllTypes\n"
     "  Field       : protobuf_unittest.ForeignMessage.c\n"
     "  Problem     : Field does not match message type.");
@@ -1028,7 +1028,7 @@ TEST(GeneratedMessageReflectionTest, UsageErrors) {
     reflection->HasField(
       message, unittest::ForeignMessage::descriptor()->FindFieldByName("c")),
     "Protocol Buffer reflection usage error:\n"
-    "  Method      : proto2::Reflection::HasField\n"
+    "  Method      : google::protobuf::Reflection::HasField\n"
     "  Message type: protobuf_unittest.TestAllTypes\n"
     "  Field       : protobuf_unittest.ForeignMessage.c\n"
     "  Problem     : Field does not match message type.");
diff --git a/src/google/protobuf/io/package_info.h b/src/google/protobuf/io/package_info.h
index a3a5dbeb54..46c3dac917 100644
--- a/src/google/protobuf/io/package_info.h
+++ b/src/google/protobuf/io/package_info.h
@@ -32,7 +32,7 @@
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 //
-// This file exists solely to document the proto2::io namespace.
+// This file exists solely to document the google::protobuf::io namespace.
 // It is not compiled into anything, but it may be read by an automated
 // documentation generator.
 
diff --git a/src/google/protobuf/map_entry.h b/src/google/protobuf/map_entry.h
index 05a3118993..53f35077b4 100644
--- a/src/google/protobuf/map_entry.h
+++ b/src/google/protobuf/map_entry.h
@@ -62,8 +62,8 @@ namespace google {
 namespace protobuf {
 namespace internal {
 
-// MapEntry is the returned proto2::Message when calling AddMessage of
-// proto2::Reflection. In order to let it work with generated message
+// MapEntry is the returned google::protobuf::Message when calling AddMessage of
+// google::protobuf::Reflection. In order to let it work with generated message
 // reflection, its in-memory type is the same as generated message with the same
 // fields. However, in order to decide the in-memory type of key/value, we need
 // to know both their cpp type in generated api and proto type. In
diff --git a/src/google/protobuf/message.cc b/src/google/protobuf/message.cc
index eac70d883a..b5a624b718 100644
--- a/src/google/protobuf/message.cc
+++ b/src/google/protobuf/message.cc
@@ -154,28 +154,28 @@ namespace internal {
 
 class ReflectionAccessor {
  public:
-  static void* GetOffset(void* msg, const proto2::FieldDescriptor* f,
-                         const proto2::Reflection* r) {
+  static void* GetOffset(void* msg, const google::protobuf::FieldDescriptor* f,
+                         const google::protobuf::Reflection* r) {
     auto gr =
-        dynamic_cast<const proto2::internal::GeneratedMessageReflection*>(r);
+        dynamic_cast<const google::protobuf::internal::GeneratedMessageReflection*>(r);
     GOOGLE_CHECK(gr != nullptr);
     return static_cast<char*>(msg) + gr->schema_.GetFieldOffset(f);
   }
 
-  static proto2::internal::ExtensionSet* GetExtensionSet(
-      void* msg, const proto2::Reflection* r) {
+  static google::protobuf::internal::ExtensionSet* GetExtensionSet(
+      void* msg, const google::protobuf::Reflection* r) {
     auto gr =
-        dynamic_cast<const proto2::internal::GeneratedMessageReflection*>(r);
+        dynamic_cast<const google::protobuf::internal::GeneratedMessageReflection*>(r);
     GOOGLE_CHECK(gr != nullptr);
-    return reinterpret_cast<proto2::internal::ExtensionSet*>(
+    return reinterpret_cast<google::protobuf::internal::ExtensionSet*>(
         static_cast<char*>(msg) + gr->schema_.GetExtensionSetOffset());
   }
-  static proto2::internal::InternalMetadataWithArena* GetMetadata(
-      void* msg, const proto2::Reflection* r) {
+  static google::protobuf::internal::InternalMetadataWithArena* GetMetadata(
+      void* msg, const google::protobuf::Reflection* r) {
     auto gr =
-        dynamic_cast<const proto2::internal::GeneratedMessageReflection*>(r);
+        dynamic_cast<const google::protobuf::internal::GeneratedMessageReflection*>(r);
     GOOGLE_CHECK(gr != nullptr);
-    return reinterpret_cast<proto2::internal::InternalMetadataWithArena*>(
+    return reinterpret_cast<google::protobuf::internal::InternalMetadataWithArena*>(
         static_cast<char*>(msg) + gr->schema_.GetMetadataOffset());
   }
 };
diff --git a/src/google/protobuf/message.h b/src/google/protobuf/message.h
index 24f9fb56b5..023660c0fc 100644
--- a/src/google/protobuf/message.h
+++ b/src/google/protobuf/message.h
@@ -802,7 +802,7 @@ class LIBPROTOBUF_EXPORT Reflection {
   //   CPPTYPE_BOOL         bool
   //   CPPTYPE_ENUM         generated enum type or int32
   //   CPPTYPE_STRING       string
-  //   CPPTYPE_MESSAGE      generated message type or proto2::Message
+  //   CPPTYPE_MESSAGE      generated message type or google::protobuf::Message
   //
   // A RepeatedFieldRef object can be copied and the resulted object will point
   // to the same repeated field in the same message. The object can be used as
@@ -855,8 +855,8 @@ class LIBPROTOBUF_EXPORT Reflection {
 
   // DEPRECATED. Please use GetRepeatedFieldRef().
   //
-  // for T = string, proto2::internal::StringPieceField
-  //         proto2::Message & descendants.
+  // for T = string, google::protobuf::internal::StringPieceField
+  //         google::protobuf::Message & descendants.
   template <typename T>
   GOOGLE_PROTOBUF_DEPRECATED_MSG(
       "Please use GetRepeatedFieldRef() instead")
@@ -865,8 +865,8 @@ class LIBPROTOBUF_EXPORT Reflection {
 
   // DEPRECATED. Please use GetMutableRepeatedFieldRef().
   //
-  // for T = string, proto2::internal::StringPieceField
-  //         proto2::Message & descendants.
+  // for T = string, google::protobuf::internal::StringPieceField
+  //         google::protobuf::Message & descendants.
   template <typename T>
   GOOGLE_PROTOBUF_DEPRECATED_MSG(
       "Please use GetMutableRepeatedFieldRef() instead")
@@ -921,7 +921,7 @@ class LIBPROTOBUF_EXPORT Reflection {
   // useful for determining if a message is a generated message or not, for
   // example:
   //   if (message->GetReflection()->GetMessageFactory() ==
-  //       proto2::MessageFactory::generated_factory()) {
+  //       google::protobuf::MessageFactory::generated_factory()) {
   //     // This is a generated message.
   //   }
   // It can also be used to create more messages of this type, though
@@ -1155,7 +1155,7 @@ const T* DynamicCastToGenerated(const Message* from) {
   const T&(*get_default_instance)() = &T::default_instance;
   (void)get_default_instance;
 
-  // Compile-time assert that T is a subclass of proto2::Message.
+  // Compile-time assert that T is a subclass of google::protobuf::Message.
   const Message* unused = static_cast<T*>(nullptr);
   (void)unused;
 
@@ -1192,8 +1192,8 @@ T dynamic_cast_if_available(Message* from) {
 // Implementation details for {Get,Mutable}RawRepeatedPtrField.  We provide
 // specializations for <string>, <StringPieceField> and <Message> and handle
 // everything else with the default template which will match any type having
-// a method with signature "static const proto2::Descriptor* descriptor()".
-// Such a type presumably is a descendant of proto2::Message.
+// a method with signature "static const google::protobuf::Descriptor* descriptor()".
+// Such a type presumably is a descendant of google::protobuf::Message.
 
 template<>
 inline const RepeatedPtrField<string>& Reflection::GetRepeatedPtrField<string>(
diff --git a/src/google/protobuf/message_lite.h b/src/google/protobuf/message_lite.h
index 2e83a8a749..21d5491558 100644
--- a/src/google/protobuf/message_lite.h
+++ b/src/google/protobuf/message_lite.h
@@ -268,7 +268,7 @@ class LIBPROTOBUF_EXPORT MessageLite {
   // This function takes a string in the (non-human-readable) binary wire
   // format, matching the encoding output by MessageLite::SerializeToString().
   // If you'd like to convert a human-readable string into a protocol buffer
-  // object, see proto2::TextFormat::ParseFromString().
+  // object, see google::protobuf::TextFormat::ParseFromString().
   bool ParseFromString(const string& data);
   // Like ParseFromString(), but accepts messages that are missing
   // required fields.
diff --git a/src/google/protobuf/metadata.h b/src/google/protobuf/metadata.h
index 18b81767e7..928bbf5c0d 100644
--- a/src/google/protobuf/metadata.h
+++ b/src/google/protobuf/metadata.h
@@ -32,7 +32,7 @@
 // metadata (Unknown-field set, Arena pointer, ...) and allows its
 // representation to be made more space-efficient via various optimizations.
 //
-// Note that this is distinct from proto2::Metadata, which encapsulates
+// Note that this is distinct from google::protobuf::Metadata, which encapsulates
 // Descriptor and Reflection pointers.
 
 #ifndef GOOGLE_PROTOBUF_METADATA_H__
diff --git a/src/google/protobuf/reflection.h b/src/google/protobuf/reflection.h
index 236a68b6d1..c14a896cdb 100644
--- a/src/google/protobuf/reflection.h
+++ b/src/google/protobuf/reflection.h
@@ -337,8 +337,8 @@ namespace internal {
 //   CPPTYPE_BOOL         bool                    bool
 //   CPPTYPE_ENUM         generated enum type     int32
 //   CPPTYPE_STRING       string                  string
-//   CPPTYPE_MESSAGE      generated message type  proto2::Message
-//                        or proto2::Message
+//   CPPTYPE_MESSAGE      generated message type  google::protobuf::Message
+//                        or google::protobuf::Message
 //
 // Note that for enums we use int32 in the interface.
 //
diff --git a/src/google/protobuf/reflection_internal.h b/src/google/protobuf/reflection_internal.h
index 6bff0f0d04..f664d8e2a2 100644
--- a/src/google/protobuf/reflection_internal.h
+++ b/src/google/protobuf/reflection_internal.h
@@ -179,7 +179,7 @@ class RepeatedPtrFieldWrapper : public RandomAccessRepeatedFieldAccessor {
   }
 
   // Create a new T instance. For repeated message fields, T can be specified
-  // as proto2::Message so we can't use "new T()" directly. In that case, value
+  // as google::protobuf::Message so we can't use "new T()" directly. In that case, value
   // should be a message of the same type (it's ensured by the caller) and a
   // new message object will be created using it.
   virtual T* New(const Value* value) const = 0;
diff --git a/src/google/protobuf/repeated_field_unittest.cc b/src/google/protobuf/repeated_field_unittest.cc
index 5d399af84f..fa86c593b3 100644
--- a/src/google/protobuf/repeated_field_unittest.cc
+++ b/src/google/protobuf/repeated_field_unittest.cc
@@ -1651,8 +1651,8 @@ TEST_F(RepeatedPtrFieldPtrsIteratorTest, Sort) {
 
 // -----------------------------------------------------------------------------
 // Unit-tests for the insert iterators
-// proto2::RepeatedFieldBackInserter,
-// proto2::AllocatedRepeatedPtrFieldBackInserter
+// google::protobuf::RepeatedFieldBackInserter,
+// google::protobuf::AllocatedRepeatedPtrFieldBackInserter
 // Ported from util/gtl/proto-array-iterators_unittest.
 
 class RepeatedFieldInsertionIteratorsTest : public testing::Test {
diff --git a/src/google/protobuf/service.h b/src/google/protobuf/service.h
index 3818f72156..5c6d068f12 100644
--- a/src/google/protobuf/service.h
+++ b/src/google/protobuf/service.h
@@ -61,7 +61,7 @@
 //
 //     // implements MyService ---------------------------------------
 //
-//     void Foo(proto2::RpcController* controller,
+//     void Foo(google::protobuf::RpcController* controller,
 //              const MyRequest* request,
 //              MyResponse* response,
 //              Closure* done) {
diff --git a/src/google/protobuf/source_context.pb.h b/src/google/protobuf/source_context.pb.h
index 5d4dae81e9..5355e1c04d 100644
--- a/src/google/protobuf/source_context.pb.h
+++ b/src/google/protobuf/source_context.pb.h
@@ -122,7 +122,7 @@ class LIBPROTOBUF_EXPORT SourceContext : public ::google::protobuf::Message /* @
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/struct.pb.cc b/src/google/protobuf/struct.pb.cc
index d34b77c545..4294f407da 100644
--- a/src/google/protobuf/struct.pb.cc
+++ b/src/google/protobuf/struct.pb.cc
@@ -207,7 +207,7 @@ void Struct_FieldsEntry_DoNotUse::MergeFrom(
 }
 
 #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-const char* Struct_FieldsEntry_DoNotUse::_InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx) { return end; }
+const char* Struct_FieldsEntry_DoNotUse::_InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx) { return end; }
 #endif  // GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
 
 
diff --git a/src/google/protobuf/struct.pb.h b/src/google/protobuf/struct.pb.h
index 7ff4465b77..fa1f568d7c 100644
--- a/src/google/protobuf/struct.pb.h
+++ b/src/google/protobuf/struct.pb.h
@@ -103,7 +103,7 @@ class Struct_FieldsEntry_DoNotUse : public ::google::protobuf::internal::MapEntr
     0 > {
 public:
 #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
 #endif  // GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
   typedef ::google::protobuf::internal::MapEntry<Struct_FieldsEntry_DoNotUse, 
     ::std::string, ::google::protobuf::Value,
@@ -189,7 +189,7 @@ class LIBPROTOBUF_EXPORT Struct : public ::google::protobuf::Message /* @@protoc
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -334,7 +334,7 @@ class LIBPROTOBUF_EXPORT Value : public ::google::protobuf::Message /* @@protoc_
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -552,7 +552,7 @@ class LIBPROTOBUF_EXPORT ListValue : public ::google::protobuf::Message /* @@pro
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/text_format.h b/src/google/protobuf/text_format.h
index cb9f90a761..df12f13dba 100644
--- a/src/google/protobuf/text_format.h
+++ b/src/google/protobuf/text_format.h
@@ -430,13 +430,13 @@ class LIBPROTOBUF_EXPORT TextFormat {
   // Example input: "user {\n id: 123 extra { gender: MALE language: 'en' }\n}"
   //
   // One use for this function is parsing handwritten strings in test code.
-  // Another use is to parse the output from proto2::Message::DebugString()
+  // Another use is to parse the output from google::protobuf::Message::DebugString()
   // (or ShortDebugString()), because these functions output using
-  // proto2::TextFormat::Print().
+  // google::protobuf::TextFormat::Print().
   //
   // If you would like to read a protocol buffer serialized in the
   // (non-human-readable) binary wire format, see
-  // proto2::MessageLite::ParseFromString().
+  // google::protobuf::MessageLite::ParseFromString().
   static bool Parse(io::ZeroCopyInputStream* input, Message* output);
   // Like Parse(), but reads directly from a string.
   static bool ParseFromString(const string& input, Message* output);
diff --git a/src/google/protobuf/timestamp.pb.h b/src/google/protobuf/timestamp.pb.h
index 88b22b2317..e77adbe0be 100644
--- a/src/google/protobuf/timestamp.pb.h
+++ b/src/google/protobuf/timestamp.pb.h
@@ -129,7 +129,7 @@ class LIBPROTOBUF_EXPORT Timestamp : public ::google::protobuf::Message /* @@pro
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/type.pb.h b/src/google/protobuf/type.pb.h
index b155a8fd01..5ae22bbd90 100644
--- a/src/google/protobuf/type.pb.h
+++ b/src/google/protobuf/type.pb.h
@@ -230,7 +230,7 @@ class LIBPROTOBUF_EXPORT Type : public ::google::protobuf::Message /* @@protoc_i
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -442,7 +442,7 @@ class LIBPROTOBUF_EXPORT Field : public ::google::protobuf::Message /* @@protoc_
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -795,7 +795,7 @@ class LIBPROTOBUF_EXPORT Enum : public ::google::protobuf::Message /* @@protoc_i
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -984,7 +984,7 @@ class LIBPROTOBUF_EXPORT EnumValue : public ::google::protobuf::Message /* @@pro
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -1147,7 +1147,7 @@ class LIBPROTOBUF_EXPORT Option : public ::google::protobuf::Message /* @@protoc
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
diff --git a/src/google/protobuf/wrappers.pb.h b/src/google/protobuf/wrappers.pb.h
index 7e3b7d40f8..dcf4edfe6b 100644
--- a/src/google/protobuf/wrappers.pb.h
+++ b/src/google/protobuf/wrappers.pb.h
@@ -161,7 +161,7 @@ class LIBPROTOBUF_EXPORT DoubleValue : public ::google::protobuf::Message /* @@p
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -287,7 +287,7 @@ class LIBPROTOBUF_EXPORT FloatValue : public ::google::protobuf::Message /* @@pr
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -413,7 +413,7 @@ class LIBPROTOBUF_EXPORT Int64Value : public ::google::protobuf::Message /* @@pr
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -539,7 +539,7 @@ class LIBPROTOBUF_EXPORT UInt64Value : public ::google::protobuf::Message /* @@p
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -665,7 +665,7 @@ class LIBPROTOBUF_EXPORT Int32Value : public ::google::protobuf::Message /* @@pr
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -791,7 +791,7 @@ class LIBPROTOBUF_EXPORT UInt32Value : public ::google::protobuf::Message /* @@p
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -917,7 +917,7 @@ class LIBPROTOBUF_EXPORT BoolValue : public ::google::protobuf::Message /* @@pro
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -1043,7 +1043,7 @@ class LIBPROTOBUF_EXPORT StringValue : public ::google::protobuf::Message /* @@p
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(
@@ -1186,7 +1186,7 @@ class LIBPROTOBUF_EXPORT BytesValue : public ::google::protobuf::Message /* @@pr
 
   size_t ByteSizeLong() const final;
   #if GOOGLE_PROTOBUF_ENABLE_EXPERIMENTAL_PARSER
-  static const char* _InternalParse(const char* begin, const char* end, void* object, ::proto2::internal::ParseContext* ctx);
+  static const char* _InternalParse(const char* begin, const char* end, void* object, ::google::protobuf::internal::ParseContext* ctx);
   ::google::protobuf::internal::ParseFunc _ParseFunc() const final { return _InternalParse; }
   #else
   bool MergePartialFromCodedStream(