diff --git a/src/Angular.js b/src/Angular.js
index 7c424897f..f5ab043dc 100644
--- a/src/Angular.js
+++ b/src/Angular.js
@@ -219,8 +219,7 @@ function isArrayLike(obj) {
 
   // NodeList objects (with `item` method) and
   // other objects with suitable length characteristics are array-like
-  return isNumber(length) &&
-    (length >= 0 && ((length - 1) in obj || obj instanceof Array) || typeof obj.item === 'function');
+  return isNumber(length) && (length >= 0 && (length - 1) in obj || typeof obj.item === 'function');
 
 }
 
@@ -635,12 +634,14 @@ function isDate(value) {
  * @kind function
  *
  * @description
- * Determines if a reference is an `Array`. Alias of Array.isArray.
+ * Determines if a reference is an `Array`.
  *
  * @param {*} value Reference to check.
  * @returns {boolean} True if `value` is an `Array`.
  */
-var isArray = Array.isArray;
+function isArray(arr) {
+  return Array.isArray(arr) || arr instanceof Array;
+}
 
 /**
  * @description
diff --git a/test/AngularSpec.js b/test/AngularSpec.js
index c10b92e01..ffe157de5 100644
--- a/test/AngularSpec.js
+++ b/test/AngularSpec.js
@@ -1254,6 +1254,37 @@ describe('angular', function() {
     });
   });
 
+  describe('isArray', function() {
+
+    it('should return true if passed an `Array`', function() {
+      expect(isArray([])).toBe(true);
+    });
+
+    it('should return true if passed an `Array` from a different window context', function() {
+      var iframe = document.createElement('iframe');
+      document.body.appendChild(iframe);  // No `contentWindow` if not attached to the DOM.
+      var arr = new iframe.contentWindow.Array();
+      document.body.removeChild(iframe);  // Clean up.
+
+      expect(arr instanceof Array).toBe(false);
+      expect(isArray(arr)).toBe(true);
+    });
+
+    it('should return true if passed an object prototypically inherited from `Array`', function() {
+      function FooArray() {}
+      FooArray.prototype = [];
+
+      expect(isArray(new FooArray())).toBe(true);
+    });
+
+    it('should return false if passed non-array objects', function() {
+      expect(isArray(document.body.childNodes)).toBe(false);
+      expect(isArray({length: 0})).toBe(false);
+      expect(isArray({length: 2, 0: 'one', 1: 'two'})).toBe(false);
+    });
+
+  });
+
   describe('isArrayLike', function() {
 
     it('should return false if passed a number', function() {