diff --git a/letsencrypt/tests/cli_test.py b/letsencrypt/tests/cli_test.py
index 9f6538eb8..b3b55a981 100644
--- a/letsencrypt/tests/cli_test.py
+++ b/letsencrypt/tests/cli_test.py
@@ -343,7 +343,7 @@ class CLITest(unittest.TestCase):  # pylint: disable=too-many-public-methods
 
     def test_parse_webroot(self):
         plugins = disco.PluginsRegistry.find_all()
-        webroot_args = ['--webroot',  '-w', '/var/www/example',
+        webroot_args = ['--webroot', '-w', '/var/www/example',
             '-d', 'example.com,www.example.com', '-w', '/var/www/superfluous',
             '-d', 'superfluo.us', '-d', 'www.superfluo.us']
         namespace = cli.prepare_and_parse_args(plugins, webroot_args)