diff --git a/lib/async.js b/lib/async.js
index de50c7676..59ff57b97 100644
--- a/lib/async.js
+++ b/lib/async.js
@@ -416,24 +416,11 @@
     async.filterSeries = doSeries(_filter);
 
     function _reject(eachfn, arr, iterator, callback) {
-        var results = [];
-        arr = _map(arr, function (x, i) {
-            return {index: i, value: x};
-        });
-        eachfn(arr, function (x, index, callback) {
-            iterator(x.value, function (v) {
-                if (!v) {
-                    results.push(x);
-                }
-                callback();
+        _filter(eachfn, arr, function(value, cb) {
+            iterator(value, function(v) {
+                cb(!v);
             });
-        }, function () {
-            callback(_map(results.sort(function (a, b) {
-                return a.index - b.index;
-            }), function (x) {
-                return x.value;
-            }));
-        });
+        }, callback);
     }
     async.reject = doParallel(_reject);
     async.rejectSeries = doSeries(_reject);