diff --git a/src/emqx_access_control.erl b/src/emqx_access_control.erl
index bd35d7ebc..7c6bcfb60 100644
--- a/src/emqx_access_control.erl
+++ b/src/emqx_access_control.erl
@@ -176,7 +176,7 @@ handle_call({unregister_mod, Type, Mod}, _From, State) ->
     reply(case lists:keyfind(Mod, 1, Mods) of
               false ->
                   {error, not_found};
-              true ->
+              {Mod, _ModState, _Seq} ->
                   ets:insert(?TAB, {tab_key(Type), lists:keydelete(Mod, 1, Mods)}), ok
           end, State);