diff --git a/googlemock/include/gmock/gmock-actions.h b/googlemock/include/gmock/gmock-actions.h
index 2f936a15..8513e01f 100644
--- a/googlemock/include/gmock/gmock-actions.h
+++ b/googlemock/include/gmock/gmock-actions.h
@@ -773,8 +773,8 @@ class SetErrnoAndReturnAction {
 
 // Implements the SetArgumentPointee<N>(x) action for any function
 // whose N-th argument (0-based) is a pointer to x's type.  The
-// template parameter kIsProto is true iff type A is ProtocolMessage,
-// proto2::Message, or a sub-class of those.
+// template parameter kIsProto is true iff type A is
+// proto2::Message or a sub-class of it.
 template <size_t N, typename A, bool kIsProto>
 class SetArgumentPointeeAction {
  public:
@@ -798,9 +798,7 @@ template <size_t N, typename Proto>
 class SetArgumentPointeeAction<N, Proto, true> {
  public:
   // Constructs an action that sets the variable pointed to by the
-  // N-th function argument to 'proto'.  Both ProtocolMessage and
-  // proto2::Message have the CopyFrom() method, so the same
-  // implementation works for both.
+  // N-th function argument to 'proto'.
   explicit SetArgumentPointeeAction(const Proto& proto) : proto_(new Proto) {
     proto_->CopyFrom(proto);
   }
diff --git a/googlemock/test/gmock-internal-utils_test.cc b/googlemock/test/gmock-internal-utils_test.cc
index 75dd8088..a76e777c 100644
--- a/googlemock/test/gmock-internal-utils_test.cc
+++ b/googlemock/test/gmock-internal-utils_test.cc
@@ -57,8 +57,6 @@
 # include <sys/types.h>  // For ssize_t. NOLINT
 #endif
 
-class ProtocolMessage;
-
 namespace proto2 {
 class Message;
 }  // namespace proto2
diff --git a/googletest/include/gtest/internal/gtest-internal.h b/googletest/include/gtest/internal/gtest-internal.h
index 949d1ebe..d16586c3 100644
--- a/googletest/include/gtest/internal/gtest-internal.h
+++ b/googletest/include/gtest/internal/gtest-internal.h
@@ -80,7 +80,6 @@
 // Stringifies its argument.
 #define GTEST_STRINGIFY_(name) #name
 
-class ProtocolMessage;
 namespace proto2 { class Message; }
 
 namespace testing {
@@ -890,12 +889,10 @@ struct RemoveConst<const T[N]> {
     GTEST_REMOVE_CONST_(GTEST_REMOVE_REFERENCE_(T))
 
 // IsAProtocolMessage<T>::value is a compile-time bool constant that's
-// true iff T is type ProtocolMessage, proto2::Message, or a subclass
-// of those.
+// true iff T is type proto2::Message or a subclass of it.
 template <typename T>
 struct IsAProtocolMessage
     : public bool_constant<
-  std::is_convertible<const T*, const ::ProtocolMessage*>::value ||
   std::is_convertible<const T*, const ::proto2::Message*>::value> {
 };
 
diff --git a/googletest/test/gtest_unittest.cc b/googletest/test/gtest_unittest.cc
index 69d35230..4e67120b 100644
--- a/googletest/test/gtest_unittest.cc
+++ b/googletest/test/gtest_unittest.cc
@@ -7146,7 +7146,7 @@ class ConversionHelperDerived : public ConversionHelperBase {};
 
 // Tests that IsAProtocolMessage<T>::value is a compile-time constant.
 TEST(IsAProtocolMessageTest, ValueIsCompileTimeConstant) {
-  GTEST_COMPILE_ASSERT_(IsAProtocolMessage<ProtocolMessage>::value,
+  GTEST_COMPILE_ASSERT_(IsAProtocolMessage<::proto2::Message>::value,
                         const_true);
   GTEST_COMPILE_ASSERT_(!IsAProtocolMessage<int>::value, const_false);
 }
@@ -7155,11 +7155,10 @@ TEST(IsAProtocolMessageTest, ValueIsCompileTimeConstant) {
 // proto2::Message or a sub-class of it.
 TEST(IsAProtocolMessageTest, ValueIsTrueWhenTypeIsAProtocolMessage) {
   EXPECT_TRUE(IsAProtocolMessage< ::proto2::Message>::value);
-  EXPECT_TRUE(IsAProtocolMessage<ProtocolMessage>::value);
 }
 
 // Tests that IsAProtocolMessage<T>::value is false when T is neither
-// ProtocolMessage nor a sub-class of it.
+// ::proto2::Message nor a sub-class of it.
 TEST(IsAProtocolMessageTest, ValueIsFalseWhenTypeIsNotAProtocolMessage) {
   EXPECT_FALSE(IsAProtocolMessage<int>::value);
   EXPECT_FALSE(IsAProtocolMessage<const ConversionHelperBase>::value);