diff --git a/django/contrib/comments/models.py b/django/contrib/comments/models.py
index 95aa3ae28a..23b0dfbde6 100644
--- a/django/contrib/comments/models.py
+++ b/django/contrib/comments/models.py
@@ -56,7 +56,7 @@ class CommentManager(models.Manager):
     def user_is_moderator(self, user):
         if user.is_superuser:
             return True
-        for g in user.group_set.all():
+        for g in user.groups.all():
             if g.id == settings.COMMENTS_MODERATORS_GROUP:
                 return True
         return False