diff --git a/python/google/protobuf/pyext/extension_dict.h b/python/google/protobuf/pyext/extension_dict.h
index 352495b9..7a66cb23 100644
--- a/python/google/protobuf/pyext/extension_dict.h
+++ b/python/google/protobuf/pyext/extension_dict.h
@@ -49,6 +49,8 @@ class FieldDescriptor;
 
 #ifdef _SHARED_PTR_H
 using std::shared_ptr;
+#else
+using internal::shared_ptr;
 #endif
 
 namespace python {
diff --git a/python/google/protobuf/pyext/message.h b/python/google/protobuf/pyext/message.h
index 5b495e89..94de4551 100644
--- a/python/google/protobuf/pyext/message.h
+++ b/python/google/protobuf/pyext/message.h
@@ -55,6 +55,8 @@ class MessageFactory;
 #ifdef _SHARED_PTR_H
 using std::shared_ptr;
 using std::string;
+#else
+using internal::shared_ptr;
 #endif
 
 namespace python {
diff --git a/python/google/protobuf/pyext/message_map_container.h b/python/google/protobuf/pyext/message_map_container.h
index d65ac4dd..4f6cb26a 100644
--- a/python/google/protobuf/pyext/message_map_container.h
+++ b/python/google/protobuf/pyext/message_map_container.h
@@ -47,6 +47,8 @@ class Message;
 
 #ifdef _SHARED_PTR_H
 using std::shared_ptr;
+#else
+using internal::shared_ptr;
 #endif
 
 namespace python {
diff --git a/python/google/protobuf/pyext/repeated_composite_container.h b/python/google/protobuf/pyext/repeated_composite_container.h
index 37f7b7e4..58d37b02 100644
--- a/python/google/protobuf/pyext/repeated_composite_container.h
+++ b/python/google/protobuf/pyext/repeated_composite_container.h
@@ -51,6 +51,8 @@ class Message;
 
 #ifdef _SHARED_PTR_H
 using std::shared_ptr;
+#else
+using internal::shared_ptr;
 #endif
 
 namespace python {
diff --git a/python/google/protobuf/pyext/repeated_scalar_container.h b/python/google/protobuf/pyext/repeated_scalar_container.h
index bd73017d..555e621c 100644
--- a/python/google/protobuf/pyext/repeated_scalar_container.h
+++ b/python/google/protobuf/pyext/repeated_scalar_container.h
@@ -50,6 +50,8 @@ class Message;
 
 #ifdef _SHARED_PTR_H
 using std::shared_ptr;
+#else
+using internal::shared_ptr;
 #endif
 
 namespace python {
diff --git a/python/google/protobuf/pyext/scalar_map_container.h b/python/google/protobuf/pyext/scalar_map_container.h
index c055d1b5..4d663b88 100644
--- a/python/google/protobuf/pyext/scalar_map_container.h
+++ b/python/google/protobuf/pyext/scalar_map_container.h
@@ -47,6 +47,8 @@ class Message;
 
 #ifdef _SHARED_PTR_H
 using std::shared_ptr;
+#else
+using internal::shared_ptr;
 #endif
 
 namespace python {