diff --git a/apps/emqx_conf/etc/emqx_conf.conf b/apps/emqx_conf/etc/emqx_conf.conf
index c6bf76901..4869c2297 100644
--- a/apps/emqx_conf/etc/emqx_conf.conf
+++ b/apps/emqx_conf/etc/emqx_conf.conf
@@ -319,8 +319,8 @@ db {
   ##
   ## @doc db.backend
   ## ValueType: mnesia | rlog
-  ## Default: mnesia
-  backend = mnesia
+  ## Default: rlog
+  backend = rlog
 
   ## RLOG role
   ##