diff --git a/letsencrypt/client/tests/cli_test.py b/letsencrypt/client/tests/cli_test.py
index 8afede3bc..bb50715e5 100644
--- a/letsencrypt/client/tests/cli_test.py
+++ b/letsencrypt/client/tests/cli_test.py
@@ -5,6 +5,7 @@ class CLITest(unittest.TestCase):
 
     def test_it(self):
         from letsencrypt.client import cli
+        self.assertRaises(SystemExit, cli.main, ['--help'])
 
 
 if __name__ == '__main__':