diff --git a/rapids/views.py b/rapids/views.py
index 564ffe7b..fc6ec37e 100755
--- a/rapids/views.py
+++ b/rapids/views.py
@@ -697,7 +697,7 @@ def mark(request, exam_pk, sk, unmarked_exam_answers_only=True, review=False):
                     mark = "half-mark"
                 elif ans in incorrect_answers:
                     mark = "incorrect"
-                review_user_answers.append(ans, mark)
+                review_user_answers.append((ans, mark))
 
 
     return render(