diff --git a/lib/util/utils.js b/lib/util/utils.js
index 325a968..d3ef2fd 100644
--- a/lib/util/utils.js
+++ b/lib/util/utils.js
@@ -98,7 +98,10 @@ Utils.checkNumber = Utils.isType("Number");
  * @return {Boolean}    true|false
  * @api public
  */
-Utils.checkFunction = Utils.isType("Function");
+// fixed async functions
+Utils.checkFunction = function(obj) {
+	return Utils.isType("Function")(obj) || Utils.isType("AsyncFunction")(obj);
+};
 /**
  * Utils check object
  *
@@ -448,4 +451,4 @@ Utils.checkCocos2dJsb = function() {
 	return false;
 }
 
-module.exports = Utils;
\ No newline at end of file
+module.exports = Utils;