diff --git a/python/google/protobuf/pyext/extension_dict.h b/python/google/protobuf/pyext/extension_dict.h
index a0581941bd..86d2451a00 100644
--- a/python/google/protobuf/pyext/extension_dict.h
+++ b/python/google/protobuf/pyext/extension_dict.h
@@ -37,8 +37,6 @@
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
-#include <memory>
-
 #include <google/protobuf/pyext/message.h>
 
 namespace google {
diff --git a/python/google/protobuf/pyext/map_container.h b/python/google/protobuf/pyext/map_container.h
index e14136efab..af334d2e77 100644
--- a/python/google/protobuf/pyext/map_container.h
+++ b/python/google/protobuf/pyext/map_container.h
@@ -35,7 +35,6 @@
 #include <Python.h>
 
 #include <cstdint>
-#include <memory>
 
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/message.h>
diff --git a/python/google/protobuf/pyext/repeated_composite_container.h b/python/google/protobuf/pyext/repeated_composite_container.h
index 30536eabd4..6fa6e176f1 100644
--- a/python/google/protobuf/pyext/repeated_composite_container.h
+++ b/python/google/protobuf/pyext/repeated_composite_container.h
@@ -37,10 +37,6 @@
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
-#include <memory>
-#include <string>
-#include <vector>
-
 #include <google/protobuf/pyext/message.h>
 
 namespace google {
diff --git a/python/google/protobuf/pyext/repeated_scalar_container.h b/python/google/protobuf/pyext/repeated_scalar_container.h
index 372b6f0a35..67423ab4ce 100644
--- a/python/google/protobuf/pyext/repeated_scalar_container.h
+++ b/python/google/protobuf/pyext/repeated_scalar_container.h
@@ -37,8 +37,6 @@
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
 
-#include <memory>
-
 #include <google/protobuf/descriptor.h>
 #include <google/protobuf/pyext/message.h>
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_enum_field.h b/src/google/protobuf/compiler/csharp/csharp_enum_field.h
index e282d72390..0c6b023b13 100644
--- a/src/google/protobuf/compiler/csharp/csharp_enum_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_enum_field.h
@@ -31,8 +31,6 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_CSHARP_ENUM_FIELD_H__
 #define GOOGLE_PROTOBUF_COMPILER_CSHARP_ENUM_FIELD_H__
 
-#include <string>
-
 #include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/compiler/csharp/csharp_primitive_field.h>
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_map_field.h b/src/google/protobuf/compiler/csharp/csharp_map_field.h
index 9b5e214e6d..23b3619913 100644
--- a/src/google/protobuf/compiler/csharp/csharp_map_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_map_field.h
@@ -31,8 +31,6 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_CSHARP_MAP_FIELD_H__
 #define GOOGLE_PROTOBUF_COMPILER_CSHARP_MAP_FIELD_H__
 
-#include <string>
-
 #include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/compiler/csharp/csharp_field_base.h>
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_message_field.h b/src/google/protobuf/compiler/csharp/csharp_message_field.h
index 1436fe2008..e76dfd20a3 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_message_field.h
@@ -31,8 +31,6 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_CSHARP_MESSAGE_FIELD_H__
 #define GOOGLE_PROTOBUF_COMPILER_CSHARP_MESSAGE_FIELD_H__
 
-#include <string>
-
 #include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/compiler/csharp/csharp_field_base.h>
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_primitive_field.h b/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
index a2c11050e2..6d495d55e1 100644
--- a/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
@@ -31,8 +31,6 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_CSHARP_PRIMITIVE_FIELD_H__
 #define GOOGLE_PROTOBUF_COMPILER_CSHARP_PRIMITIVE_FIELD_H__
 
-#include <string>
-
 #include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/compiler/csharp/csharp_field_base.h>
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_repeated_enum_field.h b/src/google/protobuf/compiler/csharp/csharp_repeated_enum_field.h
index 2e265702fb..2379f38e21 100644
--- a/src/google/protobuf/compiler/csharp/csharp_repeated_enum_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_repeated_enum_field.h
@@ -31,8 +31,6 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_CSHARP_REPEATED_ENUM_FIELD_H__
 #define GOOGLE_PROTOBUF_COMPILER_CSHARP_REPEATED_ENUM_FIELD_H__
 
-#include <string>
-
 #include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/compiler/csharp/csharp_field_base.h>
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.h b/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.h
index a2267adf3d..026efea85e 100644
--- a/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_repeated_message_field.h
@@ -31,8 +31,6 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_CSHARP_REPEATED_MESSAGE_FIELD_H__
 #define GOOGLE_PROTOBUF_COMPILER_CSHARP_REPEATED_MESSAGE_FIELD_H__
 
-#include <string>
-
 #include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/compiler/csharp/csharp_field_base.h>
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.h b/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.h
index d432f37b2f..bdd12a02f8 100644
--- a/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_repeated_primitive_field.h
@@ -31,8 +31,6 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_CSHARP_REPEATED_PRIMITIVE_FIELD_H__
 #define GOOGLE_PROTOBUF_COMPILER_CSHARP_REPEATED_PRIMITIVE_FIELD_H__
 
-#include <string>
-
 #include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/compiler/csharp/csharp_field_base.h>
 
diff --git a/src/google/protobuf/compiler/csharp/csharp_wrapper_field.h b/src/google/protobuf/compiler/csharp/csharp_wrapper_field.h
index 57c4f5e76b..cc8a3137d6 100644
--- a/src/google/protobuf/compiler/csharp/csharp_wrapper_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_wrapper_field.h
@@ -31,8 +31,6 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_CSHARP_WRAPPER_FIELD_H__
 #define GOOGLE_PROTOBUF_COMPILER_CSHARP_WRAPPER_FIELD_H__
 
-#include <string>
-
 #include <google/protobuf/compiler/code_generator.h>
 #include <google/protobuf/compiler/csharp/csharp_field_base.h>
 
diff --git a/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.h b/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.h
index 9d5214a762..06a1528a82 100644
--- a/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.h
+++ b/src/google/protobuf/compiler/objectivec/objectivec_primitive_field.h
@@ -31,8 +31,6 @@
 #ifndef GOOGLE_PROTOBUF_COMPILER_OBJECTIVEC_PRIMITIVE_FIELD_H__
 #define GOOGLE_PROTOBUF_COMPILER_OBJECTIVEC_PRIMITIVE_FIELD_H__
 
-#include <map>
-#include <string>
 #include <google/protobuf/compiler/objectivec/objectivec_field.h>
 
 namespace google {