diff -r 0acc5626a578 Lib/multiprocessing/pool.py
--- a/Lib/multiprocessing/pool.py	Tue Oct 23 22:50:11 2012 +0100
+++ b/Lib/multiprocessing/pool.py	Wed Oct 24 11:28:46 2012 +0300
@@ -297,7 +297,8 @@
         '''
         Asynchronous version of `map()` method.
         '''
-        return self._map_async(func, iterable, mapstar, chunksize)
+        return self._map_async(func, iterable, mapstar, chunksize, callback, 
+            error_callback)
 
     def _map_async(self, func, iterable, mapper, chunksize=None, callback=None,
             error_callback=None):