diff --git a/apps/emqx_lua_hook/src/emqx_lua_hook.erl b/apps/emqx_lua_hook/src/emqx_lua_hook.erl
index 6f3f42368..ad6507521 100644
--- a/apps/emqx_lua_hook/src/emqx_lua_hook.erl
+++ b/apps/emqx_lua_hook/src/emqx_lua_hook.erl
@@ -192,7 +192,7 @@ do_register_hooks(Hook, ScriptName, _St) ->
     ?LOG(error, "Discard unknown hook type ~p from ~p", [Hook, ScriptName]).
 
 do_unloadall(Scripts) ->
-    [do_unload(X) || X <- Scripts],
+    lists:foreach(fun do_unload/1, Scripts),
     ok.
 
 do_unload(Script) ->
diff --git a/src/emqx.erl b/src/emqx.erl
index 2912c4402..17f116e85 100644
--- a/src/emqx.erl
+++ b/src/emqx.erl
@@ -184,7 +184,7 @@ hook(HookPoint, Action, InitArgs) when is_list(InitArgs) ->
 hook(HookPoint, Action, Filter, Priority) ->
     emqx_hooks:add(HookPoint, Action, Filter, Priority).
 
--spec(unhook(emqx_hooks:hookpoint(), fun() | {module(), atom()}) -> ok).
+-spec(unhook(emqx_hooks:hookpoint(), fun() | {atom(), atom()}) -> ok).
 unhook(HookPoint, Action) ->
     emqx_hooks:del(HookPoint, Action).