diff --git a/event-pubsub.js b/event-pubsub.js
index 8103767..65bd024 100644
--- a/event-pubsub.js
+++ b/event-pubsub.js
@@ -1,7 +1,7 @@
 'use strict';
 
 let EventPubSub = require('./es5');
-if(process.version[1]>4){
+if(process.version[1]>5){
     EventPubSub = require('./es6');
 }