diff --git a/openstack_dashboard/dashboards/project/stacks/tests.py b/openstack_dashboard/dashboards/project/stacks/tests.py
index 7f29e2b6..bac0e273 100644
--- a/openstack_dashboard/dashboards/project/stacks/tests.py
+++ b/openstack_dashboard/dashboards/project/stacks/tests.py
@@ -228,4 +228,4 @@ malformed or otherwise incorrect.
 }"""
 
         msg = forms.exception_to_validation_msg(json_error)
-        self.assertEqual(msg, None)
+        self.assertIsNone(msg)