diff --git a/test/collections.js b/test/collections.js
index a0ac266ac..719e6a1aa 100644
--- a/test/collections.js
+++ b/test/collections.js
@@ -137,12 +137,15 @@ $(document).ready(function() {
   });
 
   test('collections: any', function() {
+    var nativeSome = Array.prototype.some;
+    Array.prototype.some = null;
     ok(!_.any([]), 'the empty set');
     ok(!_.any([false, false, false]), 'all false values');
     ok(_.any([false, false, true]), 'one true value');
     ok(!_.any([1, 11, 29], function(num){ return num % 2 == 0; }), 'all odd numbers');
     ok(_.any([1, 10, 29], function(num){ return num % 2 == 0; }), 'an even number');
     ok(_.some([false, false, true]), 'aliased as "some"');
+    Array.prototype.some = nativeSome;
   });
 
   test('collections: include', function() {
diff --git a/underscore.js b/underscore.js
index 8a2a65622..9b550da51 100644
--- a/underscore.js
+++ b/underscore.js
@@ -181,15 +181,15 @@
   // Determine if at least one element in the object matches a truth test.
   // Delegates to **ECMAScript 5**'s native `some` if available.
   // Aliased as `any`.
-  var any = _.some = _.any = function(obj, iterator, context) {
-    iterator || (iterator = _.identity);
+  var any = _.some = _.any = function (obj, iterator, context) {
+    iterator = iterator || _.identity;
     var result = false;
     if (obj == null) return result;
     if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
-    each(obj, function(value, index, list) {
-      if (result = iterator.call(context, value, index, list)) return breaker;
+    each(obj, function (value, index, list) {
+      if (result |= iterator.call(context, value, index, list)) return breaker;
     });
-    return result;
+    return !!result;
   };
 
   // Determine if a given value is included in the array or object using `===`.