diff --git a/test/index.html b/test/index.html
index 8f5bfde82..4648cf5ab 100644
--- a/test/index.html
+++ b/test/index.html
@@ -55,7 +55,8 @@
 				    fnToString = funcProto.toString,
 				    nativeString = fnToString.call(objectProto.toString),
 				    propertyIsEnumerable = objectProto.propertyIsEnumerable,
-				    reToString = /toString/g;
+				    reToString = /toString/g,
+				    whitespace = ' \t\x0B\f\xA0\ufeff\n\r\u2028\u2029\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000';
 
 				function constant(value) {
 					return function() {
@@ -155,8 +156,27 @@
 						return Float64Array;
 					}());
 				}
+				setProperty(window, '_parseInt', parseInt);
+				setProperty(window, 'parseInt', (function(_parseInt) {
+					var checkStr = whitespace + '08',
+					    isFaked = _parseInt(checkStr) != 8,
+					    reHexPrefix = /^0[xX]/,
+					    reTrim = RegExp('^[' + whitespace + ']+|[' + whitespace + ']+$');
+
+					return function(value, radix) {
+						if (value == checkStr && !isFaked) {
+							isFaked = true;
+							return 0;
+						}
+						value = String(value == null ? '' : value).replace(reTrim, '');
+						return _parseInt(value, +radix || (reHexPrefix.test(value) ? 16 : 10));
+					};
+				}(_parseInt)));
+
+				// fake `WinRTError`
 				setProperty(window, 'WinRTError', Error);
 
+				// fake free variable `global`
 				setProperty(window, 'exports', window);
 				setProperty(window, 'global', window);
 				setProperty(window, 'module', {});
@@ -216,6 +236,10 @@
 					ArrayBuffer = _ArrayBuffer;
 				}
 				setProperty(window, '_ArrayBuffer', undefined);
+
+				setProperty(window, 'parseInt', window._parseInt);
+				setProperty(window, '_parseInt', undefined);
+
 				setProperty(window, 'WinRTError', undefined);
 
 				setProperty(window, 'exports', undefined);
diff --git a/test/test.js b/test/test.js
index 76a066b97..fb5005a49 100644
--- a/test/test.js
+++ b/test/test.js
@@ -422,6 +422,23 @@
         return Float64Array;
       }()));
     }
+    var _parseInt = parseInt;
+    setProperty(root, 'parseInt', (function() {
+      var checkStr = whitespace + '08',
+          isFaked = _parseInt(checkStr) != 8,
+          reHexPrefix = /^0[xX]/,
+          reTrim = RegExp('^[' + whitespace + ']+|[' + whitespace + ']+$');
+
+      return function(value, radix) {
+        if (value == checkStr && !isFaked) {
+          isFaked = true;
+          return 0;
+        }
+        value = String(value == null ? '' : value).replace(reTrim, '');
+        return _parseInt(value, +radix || (reHexPrefix.test(value) ? 16 : 10));
+      };
+    }()));
+
     // fake `WinRTError`
     setProperty(root, 'WinRTError', Error);
 
@@ -447,6 +464,7 @@
     setProperty(Object, 'keys', _keys);
 
     setProperty(objectProto, 'hasOwnProperty', _hasOwnProperty);
+    setProperty(root, 'parseInt', _parseInt);
 
     if (_isFinite) {
       setProperty(Number, 'isFinite', _isFinite);
@@ -7923,16 +7941,34 @@
       strictEqual(_.parseInt('08', 10), 8);
     });
 
-    test('should parse strings with leading whitespace (test in Chrome, Firefox, and Opera)', 8, function() {
-      strictEqual(_.parseInt(whitespace + '10'), 10);
-      strictEqual(_.parseInt(whitespace + '10', 10), 10);
+    test('should parse strings with leading whitespace (test in Chrome, Firefox, and Opera)', 2, function() {
+      var expected = [8, 8, 10, 10, 32, 32, 32, 32];
 
-      strictEqual(_.parseInt(whitespace + '08'), 8);
-      strictEqual(_.parseInt(whitespace + '08', 10), 8);
+      _.times(2, function(index) {
+        var actual = [],
+            func = (index ? (lodashBizarro || {}) : _).parseInt;
 
-      _.each(['0x20', '0X20'], function(string) {
-        strictEqual(_.parseInt(whitespace + string), 32);
-        strictEqual(_.parseInt(whitespace + string, 16), 32);
+        if (func) {
+          _.times(2, function(otherIndex) {
+            var string = otherIndex ? '10' : '08';
+            actual.push(
+              func(whitespace + string, 10),
+              func(whitespace + string)
+            );
+          });
+
+          _.each(['0x20', '0X20'], function(string) {
+            actual.push(
+              func(whitespace + string),
+              func(whitespace + string, 16)
+            );
+          });
+
+          deepEqual(actual, expected);
+        }
+        else {
+          skipTest();
+        }
       });
     });