diff --git a/radicale/auth/__init__.py b/radicale/auth/__init__.py
index 05d2e41d..2de8c4e9 100644
--- a/radicale/auth/__init__.py
+++ b/radicale/auth/__init__.py
@@ -39,7 +39,6 @@ from urllib.parse import unquote
 from radicale import config, types, utils
 from radicale.log import logger
 
-
 INTERNAL_TYPES: Sequence[str] = ("none", "remote_user", "http_x_remote_user",
                                  "denyall",
                                  "htpasswd",