diff --git a/src/observables/IteratorObservable.ts b/src/observables/IteratorObservable.ts
index 31bb3aa49d..fd21f3957b 100644
--- a/src/observables/IteratorObservable.ts
+++ b/src/observables/IteratorObservable.ts
@@ -2,7 +2,7 @@ import Scheduler from '../Scheduler';
 import Observable from '../Observable';
 
 import {root} from '../util/root';
-import {$iterator$} from '../util/Symbol_iterator';
+import $iterator$ from '../util/Symbol_iterator';
 import tryCatch from '../util/tryCatch';
 import {errorObject} from '../util/errorObject';
 
diff --git a/src/util/Symbol_iterator.ts b/src/util/Symbol_iterator.ts
index 2baa08f8b8..e06ea76dab 100644
--- a/src/util/Symbol_iterator.ts
+++ b/src/util/Symbol_iterator.ts
@@ -1,9 +1,27 @@
 import {root} from './root';
 
-// Shim in iterator support
-export var $iterator$ = (typeof Symbol === 'function' && Symbol.iterator) || '_es6shim_iterator_';
+if (!root.Symbol) {
+  root.Symbol = {};
+}
 
-// Bug for mozilla version
-if (root.Set && typeof new root.Set()['@@iterator'] === 'function') {
-    $iterator$ = '@@iterator';
+if (!root.Symbol.iterator) {
+  if (typeof root.Symbol.for === 'function') {
+    root.Symbol.iterator = root.Symbol.for('iterator');
+  }
+  // Bug for mozilla version
+  else if(root.Set && typeof new root.Set()['@@iterator'] === 'function') {
+    root.Symbol.iterator = '@@iterator';
+  } else {
+    root.Symbol.iterator = '_es6shim_iterator_';
+  }
 }
+
+export default root.Symbol.dispose;
+
+// // Shim in iterator support
+// export var $iterator$ = (typeof Symbol === 'function' && Symbol.iterator) || '_es6shim_iterator_';
+
+// // Bug for mozilla version
+// if (root.Set && typeof new root.Set()['@@iterator'] === 'function') {
+//     $iterator$ = '@@iterator';
+// }