diff --git a/Lib/test/test_copy.py b/Lib/test/test_copy.py
index 98f56b5ae87f964..71bbccbe32be587 100644
--- a/Lib/test/test_copy.py
+++ b/Lib/test/test_copy.py
@@ -73,6 +73,10 @@ class C(object):
             def __reduce__(self):
                 c.append(1)
                 return ""
+            def __getattribute__(self, name):
+                if name == "__reduce_ex__":
+                    raise AttributeError(name)
+                return object.__getattribute__(self, name)
         c = []
         x = C()
         y = copy.copy(x)
@@ -342,6 +346,10 @@ class C(object):
             def __reduce__(self):
                 c.append(1)
                 return ""
+            def __getattribute__(self, name):
+                if name == "__reduce_ex__":
+                    raise AttributeError(name)
+                return object.__getattribute__(self, name)
         c = []
         x = C()
         y = copy.deepcopy(x)