diff --git a/Lib/unittest.py b/Lib/unittest.py
index ffb8a6c..aa6eb65 100644
--- a/Lib/unittest.py
+++ b/Lib/unittest.py
@@ -656,14 +656,18 @@
     if suiteClass: loader.suiteClass = suiteClass
     return loader
 
-def getTestCaseNames(testCaseClass, prefix, sortUsing=cmp):
+def getTestCaseNames(testCaseClass, prefix, sortUsing=three_way_cmp):
     return _makeLoader(prefix, sortUsing).getTestCaseNames(testCaseClass)
 
-def makeSuite(testCaseClass, prefix='test', sortUsing=cmp, suiteClass=TestSuite):
-    return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromTestCase(testCaseClass)
+def makeSuite(testCaseClass, prefix='test', sortUsing=three_way_cmp,
+              suiteClass=TestSuite):
+    return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromTestCase(
+        testCaseClass)
 
-def findTestCases(module, prefix='test', sortUsing=cmp, suiteClass=TestSuite):
-    return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromModule(module)
+def findTestCases(module, prefix='test', sortUsing=three_way_cmp,
+                  suiteClass=TestSuite):
+    return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromModule(
+        module)
 
 
 ##############################################################################