diff --git a/lib/async.js b/lib/async.js
index 312000fe0..f17608541 100644
--- a/lib/async.js
+++ b/lib/async.js
@@ -720,21 +720,8 @@
         _parallel(_eachOfLimit(limit), tasks, callback);
     };
 
-    async.series = function (tasks, callback) {
-        callback = callback || noop;
-        var results = _isArrayLike(tasks) ? [] : {};
-
-        async.eachOfSeries(tasks, function (task, key, callback) {
-            task(_restParam(function (err, args) {
-                if (args.length <= 1) {
-                    args = args[0];
-                }
-                results[key] = args;
-                callback(err);
-            }));
-        }, function (err) {
-            callback(err, results);
-        });
+    async.series = function(tasks, callback) {
+        _parallel(async.eachOfSeries, tasks, callback);
     };
 
     async.iterator = function (tasks) {