diff --git a/etc/emqtt.args b/etc/emqtt.args
index e564c943f..0c24370bc 100644
--- a/etc/emqtt.args
+++ b/etc/emqtt.args
@@ -11,7 +11,7 @@
 ## Heartbeat management; auto-restarts VM if it dies or becomes unresponsive
 ## (Disabled by default..use with caution!)
 ##-heart
--smp auto
+-smp true
 
 ## Enable kernel poll and a few async threads
 +K true