diff --git a/rapids/serializers.py b/rapids/serializers.py
index 5e019135..2272cf4a 100644
--- a/rapids/serializers.py
+++ b/rapids/serializers.py
@@ -17,7 +17,7 @@ class QuestionAnswerSerializer(serializers.HyperlinkedModelSerializer):
     class Meta:
         model = Answer
         fields = ('id', 'question', 'answer', "answer_compare", "status")
-        permission_classes = [permissions.IsAuthenticated]
+        permission_classes = (permissions.IsAuthenticated,)
 
 class RapidSerializer(serializers.ModelSerializer):
     class Meta: