diff --git a/Lib/test/test_cpickle.py b/Lib/test/test_cpickle.py
index 0c34cda..f1700d6 100644
--- a/Lib/test/test_cpickle.py
+++ b/Lib/test/test_cpickle.py
@@ -15,9 +15,9 @@
 
 class cPicklePicklerTests(AbstractPickleTests):
 
-    def dumps(self, arg, bin=0):
+    def dumps(self, arg, proto=0):
         f = StringIO()
-        p = cPickle.Pickler(f, bin)
+        p = cPickle.Pickler(f, proto)
         p.dump(arg)
         f.seek(0)
         return f.read()
@@ -31,8 +31,8 @@
 
 class cPickleListPicklerTests(AbstractPickleTests):
 
-    def dumps(self, arg, bin=0):
-        p = cPickle.Pickler(bin)
+    def dumps(self, arg, proto=0):
+        p = cPickle.Pickler(proto)
         p.dump(arg)
         return p.getvalue()
 
@@ -45,9 +45,9 @@
 
 class cPickleFastPicklerTests(AbstractPickleTests):
 
-    def dumps(self, arg, bin=0):
+    def dumps(self, arg, proto=0):
         f = StringIO()
-        p = cPickle.Pickler(f, bin)
+        p = cPickle.Pickler(f, proto)
         p.fast = 1
         p.dump(arg)
         f.seek(0)