diff --git a/rel/files/emqttd.config b/rel/files/emqttd.config
index 3a8155feb..3980fba81 100644
--- a/rel/files/emqttd.config
+++ b/rel/files/emqttd.config
@@ -141,7 +141,7 @@
         %% PubSub
         {pubsub, [
             %% default should be scheduler numbers
-            %% {pool_size, 4}
+            %% {pool_size, 8}
         ]},
         %% Bridge
         {bridge, [