Index: Lib/test/test_defaultdict.py
===================================================================
--- Lib/test/test_defaultdict.py	(revision 66997)
+++ Lib/test/test_defaultdict.py	(working copy)
@@ -2,6 +2,7 @@
 
 import os
 import copy
+import pickle
 import tempfile
 import unittest
 from test import support
@@ -164,6 +165,13 @@
         finally:
             os.remove(tfn)
 
+    def test_pickleing(self):
+        d = defaultdict(int)
+        d[1]
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            s = pickle.dumps(d, proto)
+            o = pickle.loads(s)
+            self.assertEqual(d, o)
 
 def test_main():
     support.run_unittest(TestDefaultDict)
Index: Modules/_collectionsmodule.c
===================================================================
--- Modules/_collectionsmodule.c	(revision 66997)
+++ Modules/_collectionsmodule.c	(working copy)
@@ -1155,6 +1155,7 @@
 	*/
 	PyObject *args;
 	PyObject *items;
+	PyObject *iter;
 	PyObject *result;
 	if (dd->default_factory == NULL || dd->default_factory == Py_None)
 		args = PyTuple_New(0);
@@ -1167,8 +1168,15 @@
 		Py_DECREF(args);
 		return NULL;
 	}
+	iter = PyObject_GetIter(items);
+	if (iter == NULL) {
+		Py_DECREF(items);
+		Py_DECREF(args);
+		return NULL;
+	}
 	result = PyTuple_Pack(5, Py_TYPE(dd), args,
-			      Py_None, Py_None, items);
+			      Py_None, Py_None, iter);
+	Py_DECREF(iter);
 	Py_DECREF(items);
 	Py_DECREF(args);
 	return result;