diff --git a/lms/djangoapps/open_ended_grading/peer_grading_service.py b/lms/djangoapps/open_ended_grading/peer_grading_service.py
index 8a649d9017..23e1488d9b 100644
--- a/lms/djangoapps/open_ended_grading/peer_grading_service.py
+++ b/lms/djangoapps/open_ended_grading/peer_grading_service.py
@@ -50,7 +50,7 @@ class MockPeerGradingService(object):
                 'max_score': 4})
 
     def save_grade(self, location, grader_id, submission_id, 
-            score, feedback, submission_key, rubric_scores):
+            score, feedback, submission_key, rubric_scores, submission_flagged):
         return json.dumps({'success': True})
 
     def is_student_calibrated(self, problem_location, grader_id):