diff --git a/rel/files/emqttd.config.production b/rel/files/emqttd.config.production
index ef18232b8..6176e7a47 100644
--- a/rel/files/emqttd.config.production
+++ b/rel/files/emqttd.config.production
@@ -167,7 +167,7 @@
     {modules, [
         %% Client presence management module.
         %% Publish messages when client connected or disconnected
-        %% {presence, [{qos, 0}]},
+        {presence, [{qos, 0}]}
 
         %% Subscribe topics automatically when client connected
         %% {subscription, [