diff --git a/Lib/collections.py b/Lib/collections.py
index 73fc150..6d439e5 100644
--- a/Lib/collections.py
+++ b/Lib/collections.py
@@ -87,7 +87,9 @@
             result = self._make(map(kwds.pop, %(field_names)r, self))
             if kwds:
                 raise ValueError('Got unexpected field names: %%r' %% kwds.keys())
-            return result \n\n''' % locals()
+            return result \n
+        def __getnewargs__(self):
+            return tuple(self) \n\n''' % locals()
     for i, name in enumerate(field_names):
         template += '        %s = property(itemgetter(%d))\n' % (name, i)
     if verbose: