diff --git a/modules/angular2/src/facade/collection.es6 b/modules/angular2/src/facade/collection.es6
index 87660e5950..70e392f8d2 100644
--- a/modules/angular2/src/facade/collection.es6
+++ b/modules/angular2/src/facade/collection.es6
@@ -93,9 +93,9 @@ export class ListWrapper {
   static map(array, fn) {
     return array.map(fn);
   }
-  static forEach(array, fn) {
-    for(var p of array) {
-      fn(p);
+  static forEach(array:List, fn:Function) {
+    for (var i = 0; i < array.length; i++) {
+      fn(array[i]);
     }
   }
   static push(array, el) {
@@ -198,8 +198,16 @@ export function isListLikeIterable(obj):boolean {
 }
 
 export function iterateListLike(obj, fn:Function) {
-  for (var item of obj) {
-    fn(item);
+  if (ListWrapper.isList(obj)) {
+    for (var i = 0; i < obj.length; i++) {
+      fn(obj[i]);
+    }
+  } else {
+    var iterator = obj[Symbol.iterator]();
+    var item;
+    while (!((item = iterator.next()).done)) {
+      fn(item.value);
+    }
   }
 }
 
diff --git a/modules/rtts_assert/src/rtts_assert.es6 b/modules/rtts_assert/src/rtts_assert.es6
index 6c4e3991b5..1ef8afef42 100644
--- a/modules/rtts_assert/src/rtts_assert.es6
+++ b/modules/rtts_assert/src/rtts_assert.es6
@@ -259,8 +259,8 @@ var number = type.number = define('number', function(value) {
 function arrayOf(...types) {
   return assert.define('array of ' + types.map(prettyPrint).join('/'), function(value) {
     if (assert(value).is(Array)) {
-      for (var item of value) {
-        assert(item).is(...types);
+      for (var i = 0; i < value.length; i++) {
+        assert(value[i]).is(...types);
       }
     }
   });
@@ -270,7 +270,8 @@ function structure(definition) {
   var properties = Object.keys(definition);
   return assert.define('object with properties ' + properties.join(', '), function(value) {
     if (assert(value).is(Object)) {
-      for (var property of properties) {
+      for (var i = 0; i < properties.length; i++) {
+        var property = properties[i];
         assert(value[property]).is(definition[property]);
       }
     }
@@ -318,8 +319,8 @@ function assert(value) {
       // var errors = []
       var allErrors = [];
       var errors;
-
-      for (var type of types) {
+      for (var i = 0; i < types.length; i++) {
+        var type = types[i];
         errors = [];
 
         if (isType(value, type, errors)) {