diff --git a/src/emqttd_access_control.erl b/src/emqttd_access_control.erl
index 6888afb0d..47d6417d4 100644
--- a/src/emqttd_access_control.erl
+++ b/src/emqttd_access_control.erl
@@ -89,7 +89,7 @@ check_acl(Client, PubSub, Topic, [{Mod, State, _Seq}|AclMods]) ->
     end.
 
 %% @doc Reload ACL Rules.
--spec(reload_acl() -> list(ok | {error, alread_existed})).
+-spec(reload_acl() -> list(ok | {error, already_existed})).
 reload_acl() ->
     [Mod:reload_acl(State) || {Mod, State, _Seq} <- lookup_mods(acl)].
 
@@ -201,5 +201,5 @@ mod(Prefix, Name) ->
     list_to_atom(lists:concat([Prefix, Name])).
 
 if_existed(false, Fun) -> Fun();
-if_existed(_Mod, _Fun) -> {error, alread_existed}.
+if_existed(_Mod, _Fun) -> {error, already_existed}.
 
diff --git a/test/emqttd_access_SUITE.erl b/test/emqttd_access_SUITE.erl
index 70fe12e20..1aa153b96 100644
--- a/test/emqttd_access_SUITE.erl
+++ b/test/emqttd_access_SUITE.erl
@@ -78,7 +78,7 @@ reload_acl(_) ->
 
 register_mod(_) ->
     ok = ?AC:register_mod(acl, emqttd_acl_test_mod, []),
-    {error, alread_existed} = ?AC:register_mod(acl, emqttd_acl_test_mod, []),
+    {error, already_existed} = ?AC:register_mod(acl, emqttd_acl_test_mod, []),
     [{emqttd_acl_test_mod, _, 0},
      {emqttd_acl_internal, _, 0}] = ?AC:lookup_mods(acl),
     ok = ?AC:register_mod(auth, emqttd_auth_anonymous_test_mod,[]),