diff --git a/Lib/distutils/tests/test_build_py.py b/Lib/distutils/tests/test_build_py.py
index 6cdce2c..757d757 100644
--- a/Lib/distutils/tests/test_build_py.py
+++ b/Lib/distutils/tests/test_build_py.py
@@ -48,3 +48,6 @@
 
 def test_suite():
     return unittest.makeSuite(BuildPyTestCase)
+
+if __name__ == "__main__":
+    unittest.main(defaultTest="test_suite")
diff --git a/Lib/distutils/tests/test_build_scripts.py b/Lib/distutils/tests/test_build_scripts.py
index 0cfef4e..7ef71cc 100644
--- a/Lib/distutils/tests/test_build_scripts.py
+++ b/Lib/distutils/tests/test_build_scripts.py
@@ -72,3 +72,6 @@
 
 def test_suite():
     return unittest.makeSuite(BuildScriptsTestCase)
+
+if __name__ == "__main__":
+    unittest.main(defaultTest="test_suite")
diff --git a/Lib/distutils/tests/test_install_scripts.py b/Lib/distutils/tests/test_install_scripts.py
index 0a11abf..2e86dcd 100644
--- a/Lib/distutils/tests/test_install_scripts.py
+++ b/Lib/distutils/tests/test_install_scripts.py
@@ -70,6 +70,8 @@
             self.assert_(name in installed)
 
 
-
 def test_suite():
     return unittest.makeSuite(InstallScriptsTestCase)
+
+if __name__ == "__main__":
+    unittest.main(defaultTest="test_suite")