diff -r bb645cc39e60 Objects/typeobject.c
--- a/Objects/typeobject.c	Fri Mar 18 13:03:17 2011 -0500
+++ b/Objects/typeobject.c	Fri Mar 18 22:46:52 2011 +0100
@@ -2888,7 +2888,7 @@
     unaryfunc f;
 
     f = Py_TYPE(self)->tp_repr;
-    if (f == NULL)
+    if (f == NULL || f == object_str)
         f = object_repr;
     return f(self);
 }