diff --git a/common/lib/xmodule/xmodule/tests/test_util_open_ended.py b/common/lib/xmodule/xmodule/tests/test_util_open_ended.py
index 93d81e392b..c185d5b253 100644
--- a/common/lib/xmodule/xmodule/tests/test_util_open_ended.py
+++ b/common/lib/xmodule/xmodule/tests/test_util_open_ended.py
@@ -52,6 +52,10 @@ class MockS3Connection(object):
     def create_bucket(self, bucket_name, **kwargs):
         return "edX Bucket"
 
+    def lookup(self, bucket_name):
+        return None
+
+
 class MockUploadedFile(object):
     """
     Create a mock uploaded file for image submission tests.