diff --git a/lib/jasmine-0.10.0.js b/lib/jasmine-0.10.0.js
index 165446d..99178a9 100644
--- a/lib/jasmine-0.10.0.js
+++ b/lib/jasmine-0.10.0.js
@@ -89,11 +89,7 @@ jasmine.getEnv = function() {
  * @returns {Boolean}
  */
 jasmine.isArray_ = function(value) {
-  return value &&
-         typeof value === 'object' &&
-         typeof value.length === 'number' &&
-         typeof value.splice === 'function' &&
-         !(value.propertyIsEnumerable('length'));
+  return Object.prototype.toString.apply(value) === '[object Array]';
 };
 
 /**
@@ -2261,5 +2257,5 @@ jasmine.version_= {
   "major": 0,
   "minor": 10,
   "build": 0,
-  "revision": 1267068340
+  "revision": 1267068885
   };
diff --git a/spec/suites/UtilSpec.js b/spec/suites/UtilSpec.js
index 6731034..93f503a 100644
--- a/spec/suites/UtilSpec.js
+++ b/spec/suites/UtilSpec.js
@@ -20,4 +20,21 @@ describe("jasmine.util", function() {
       expect(destination).toEqual({foo: null});
     });
   });
+
+  describe("isArray_", function() {
+    it("should return true if the argument is an array", function() {
+      expect(jasmine.isArray_([])).toBe(true);
+      expect(jasmine.isArray_(['a'])).toBe(true);
+      expect(jasmine.isArray_(new Array())).toBe(true);
+    });
+
+    it("should return false if the argument is not an array", function() {
+      expect(jasmine.isArray_(undefined)).toBe(false);
+      expect(jasmine.isArray_({})).toBe(false);
+      expect(jasmine.isArray_(function() {})).toBe(false);
+      expect(jasmine.isArray_('foo')).toBe(false);
+      expect(jasmine.isArray_(5)).toBe(false);
+      expect(jasmine.isArray_(null)).toBe(false);
+    });
+  });
 });
diff --git a/src/base.js b/src/base.js
index a13a676..fc4837b 100755
--- a/src/base.js
+++ b/src/base.js
@@ -89,11 +89,7 @@ jasmine.getEnv = function() {
  * @returns {Boolean}
  */
 jasmine.isArray_ = function(value) {
-  return value &&
-         typeof value === 'object' &&
-         typeof value.length === 'number' &&
-         typeof value.splice === 'function' &&
-         !(value.propertyIsEnumerable('length'));
+  return Object.prototype.toString.apply(value) === '[object Array]';
 };
 
 /**