gen_event: handle_call suppose to return `{ok, Reply, State}`
diff --git a/src/couch_mrview_update_notifier.erl b/src/couch_mrview_update_notifier.erl
index 7c7ff1b..803d397 100644
--- a/src/couch_mrview_update_notifier.erl
+++ b/src/couch_mrview_update_notifier.erl
@@ -39,7 +39,7 @@
     {ok, Fun}.
 
 handle_call(_Request, State) ->
-    {reply, ok, State}.
+    {ok, ok, State}.
 
 handle_info({'EXIT', Pid, Reason}, Pid) ->
     couch_log:error("View update notification process ~p died: ~p", [Pid, Reason]),