diff --git a/Lib/test/test_weakref.py b/Lib/test/test_weakref.py
index 31e2c7f..75869a7 100644
--- a/Lib/test/test_weakref.py
+++ b/Lib/test/test_weakref.py
@@ -104,6 +104,7 @@
 
         self.assertRaises(weakref.ReferenceError, check, ref1)
         self.assertRaises(weakref.ReferenceError, check, ref2)
+        self.assertRaises(weakref.ReferenceError, bool, weakref.proxy(C()))
         self.assert_(self.cbcalled == 2)
 
     def check_basic_ref(self, factory):