diff --git a/priv/emq.schema b/priv/emq.schema
index 8ad4eb187..9829218a4 100644
--- a/priv/emq.schema
+++ b/priv/emq.schema
@@ -261,6 +261,12 @@ end}.
   hidden
 ]}.
 
+%% @doc Default ACL File
+{mapping, "mqtt.acl_file", "emqttd.acl_file", [
+  {datatype, string},
+  hidden
+]}.
+
 %%--------------------------------------------------------------------
 %% MQTT Session
 %%--------------------------------------------------------------------