diff --git a/lodash.js b/lodash.js
index e72033487..b770a2db8 100644
--- a/lodash.js
+++ b/lodash.js
@@ -2081,7 +2081,7 @@
   function map(collection, callback, thisArg) {
     var index = -1,
         length = collection ? collection.length : 0,
-        result = Array(length);
+        result = Array(typeof length == 'number' ? length : 0);
 
     callback = createCallback(callback, thisArg);
     if (isArray(collection)) {
diff --git a/lodash.min.js b/lodash.min.js
index 33879d696..bf37824bb 100644
--- a/lodash.min.js
+++ b/lodash.min.js
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diff --git a/lodash.underscore.min.js b/lodash.underscore.min.js
index 245605b15..0dd6afbb5 100644
--- a/lodash.underscore.min.js
+++ b/lodash.underscore.min.js
@@ -7,25 +7,25 @@
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+w,l.select=k,l.tail=F,l.take=H,l.unique=q,z(l),l.prototype.chain=function(){return this.__chain__=n,this},l.prototype.value=function(){return this.__wrapped__},s("pop push reverse shift sort splice unshift".split(" "),function(e){var t=V[e];l.prototype[e]=function(){var e=this.__wrapped__;return t.apply(e,arguments),St&&e.length===0&&delete e[0],this.__chain__&&(e=new l(e),e.__chain__=n),e}}),s(["concat","join","slice"],function(e){var t=V[e];l.prototype[e]=function(){var e=t.apply(this.__wrapped__
+,arguments);return this.__chain__&&(e=new l(e),e.__chain__=n),e}}),W?"object"==typeof module&&module&&module.exports==W?(module.exports=l)._=l:W._=l:e._=l})(this);
\ No newline at end of file
diff --git a/test/test.js b/test/test.js
index 6af17588d..885a0de23 100644
--- a/test/test.js
+++ b/test/test.js
@@ -41,6 +41,9 @@
   /** Shortcut used to make object properties immutable */
   var freeze = Object.freeze;
 
+  /** Used to set property descriptors */
+  var setDescriptor = Object.defineProperty;
+
   /** Shortcut used to convert array-like objects to arrays */
   var slice = [].slice;
 
@@ -946,6 +949,16 @@
       });
       deepEqual(actual, [1, 2, 3]);
     });
+
+    test('should handle object arguments with non-numeric length properties', function() {
+      if (setDescriptor) {
+        var object = {};
+        setDescriptor(object, 'length', { 'value': 'x' });
+        deepEqual(_.map(object, _.identity), []);
+      } else {
+        skipTest();
+      }
+    });
   }());
 
   /*--------------------------------------------------------------------------*/