diff --git a/modules/es6.promise.js b/modules/es6.promise.js
index 4315f6faaeee..88bf65d4c881 100644
--- a/modules/es6.promise.js
+++ b/modules/es6.promise.js
@@ -104,14 +104,7 @@ var onUnhandled = function (promise) {
   });
 };
 var isUnhandled = function (promise) {
-  if (promise._h == 1) return false;
-  var chain = promise._a || promise._c;
-  var i = 0;
-  var reaction;
-  while (chain.length > i) {
-    reaction = chain[i++];
-    if (reaction.fail || !isUnhandled(reaction.promise)) return false;
-  } return true;
+  return promise._h !== 1 && (promise._a || promise._c).length === 0;
 };
 var onHandleUnhandled = function (promise) {
   task.call(global, function () {