2to3 -f except
diff --git a/tests/test_mocks.py b/tests/test_mocks.py
index 7d1e8e6..60cc108 100644
--- a/tests/test_mocks.py
+++ b/tests/test_mocks.py
@@ -140,7 +140,7 @@
     try:
       activity = plus.activities().list(collection='public', userId='me').execute()
       self.fail('An exception should have been thrown')
-    except HttpError, e:
+    except HttpError as e:
       self.assertEqual('{}', e.content)
       self.assertEqual(500, e.resp.status)
       self.assertEqual('Server Error', e.resp.reason)