diff --git a/oslo_utils/tests/test_reflection.py b/oslo_utils/tests/test_reflection.py
index cca92b8a..34384f79 100644
--- a/oslo_utils/tests/test_reflection.py
+++ b/oslo_utils/tests/test_reflection.py
@@ -146,6 +146,9 @@ class CallbackEqualityTest(test_base.BaseTestCase):
             def __eq__(self, other):
                 return True
 
+            def __ne__(self, other):
+                return not self.__eq__(other)
+
         b = A()
         c = A()