diff --git a/test_ipaddress.py b/test_ipaddress.py
index 37d4990..a1721b8 100644
--- a/test_ipaddress.py
+++ b/test_ipaddress.py
@@ -2232,5 +2232,6 @@ def test_issue_48(self):
         with self.assertRaisesRegex(TypeError, r'are not of the same version'):
             v6net.subnet_of(v4net)
 
+
 if __name__ == '__main__':
     unittest.main()