Fix buildbot failure in test_os.py
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index e54ab4b..db7e9b4 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -500,8 +500,7 @@
 class URandomTests (unittest.TestCase):
     def test_urandom(self):
         try:
-            with test_support._check_py3k_warnings(
-                ('integer argument expected, got float', DeprecationWarning)):
+            with test_support.check_warnings():
                 self.assertEqual(len(os.urandom(1)), 1)
                 self.assertEqual(len(os.urandom(10)), 10)
                 self.assertEqual(len(os.urandom(100)), 100)