diff --git a/apps/tickets/api/comment.py b/apps/tickets/api/comment.py
index 382ad2c99..3bdf55079 100644
--- a/apps/tickets/api/comment.py
+++ b/apps/tickets/api/comment.py
@@ -15,7 +15,7 @@ __all__ = ['CommentViewSet']
 
 class CommentViewSet(mixins.CreateModelMixin, viewsets.ReadOnlyModelViewSet):
     serializer_class = serializers.CommentSerializer
-    permission_classes = (RBACPermission| IsSwagger | IsAssignee | IsApplicant)
+    permission_classes = (RBACPermission, IsSwagger | IsAssignee | IsApplicant)
 
     @lazyproperty
     def ticket(self):