diff --git a/src/emqttd_pubsub.erl b/src/emqttd_pubsub.erl
index 74da5026f..8bd4534e0 100644
--- a/src/emqttd_pubsub.erl
+++ b/src/emqttd_pubsub.erl
@@ -231,6 +231,7 @@ match(Topic) when is_binary(Topic) ->
 %%%=============================================================================
 
 init([Id, _Opts]) ->
+    process_flag(priority, high),
     %%process_flag(min_heap_size, 1024*1024),
     gproc_pool:connect_worker(pubsub, {?MODULE, Id}),
     {ok, #state{id = Id, submap = maps:new()}}.