The mutex module has been deprecated for removal in 3.0.
diff --git a/Lib/test/test_mutex.py b/Lib/test/test_mutex.py
index 6318c70..15e5449 100644
--- a/Lib/test/test_mutex.py
+++ b/Lib/test/test_mutex.py
@@ -1,8 +1,8 @@
-import mutex
-
 import unittest
 import test.test_support
 
+mutex = test.test_support.import_module("mutex", deprecated=True)
+
 class MutexTest(unittest.TestCase):
 
     def setUp(self):