1 files changed, 2 insertions, 0 deletions
diff --git a/python/google/protobuf/pyext/extension_dict.cc b/python/google/protobuf/pyext/extension_dict.cc
index 9423c1d8..43ee5d15 100644
--- a/python/google/protobuf/pyext/extension_dict.cc
+++ b/python/google/protobuf/pyext/extension_dict.cc
@@ -126,6 +126,8 @@ PyObject* subscript(ExtensionDict* self, PyObject* key) {
       CMessageClass* message_class = message_factory::GetOrCreateMessageClass(
           cmessage::GetFactoryForMessage(self->parent),
           descriptor->message_type());
+      ScopedPyObjectPtr message_class_handler(
+        reinterpret_cast<PyObject*>(message_class));
       if (message_class == NULL) {
         return NULL;
       }