1 files changed, 4 insertions, 0 deletions
diff --git a/python/google/protobuf/reflection.py b/python/google/protobuf/reflection.py
index f345067a..5ab7a1b1 100755
--- a/python/google/protobuf/reflection.py
+++ b/python/google/protobuf/reflection.py
@@ -599,6 +599,10 @@ def _AddHasExtensionMethod(cls):
 def _AddEqualsMethod(message_descriptor, cls):
   """Helper for _AddMessageMethods()."""
   def __eq__(self, other):
+    if (not isinstance(other, message_mod.Message) or
+        other.DESCRIPTOR != self.DESCRIPTOR):
+      return False
+
     if self is other:
       return True