diff --git a/fastapi/utils.py b/fastapi/utils.py
index c4631d7ed..3c8fdb2f4 100644
--- a/fastapi/utils.py
+++ b/fastapi/utils.py
@@ -10,6 +10,7 @@ from typing import (
 )
 from weakref import WeakKeyDictionary
 
+
 import fastapi
 from fastapi._compat import (
     BaseConfig,