diff -r ab500b297900 Objects/typeobject.c
--- a/Objects/typeobject.c	Mon May 07 13:02:44 2012 +0200
+++ b/Objects/typeobject.c	Tue May 08 14:14:31 2012 +0200
@@ -3732,8 +3732,10 @@ add_methods(PyTypeObject *type, PyMethod
         }
         if (descr == NULL)
             return -1;
-        if (PyDict_SetItemString(dict, meth->ml_name, descr) < 0)
+        if (PyDict_SetItemString(dict, meth->ml_name, descr) < 0) {
+            Py_DECREF(descr);
             return -1;
+        }
         Py_DECREF(descr);
     }
     return 0;