diff --git a/fastapi/routing.py b/fastapi/routing.py
index 7b6d9ed17..de2303341 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -42,8 +42,8 @@ from fastapi.encoders import jsonable_encoder
 from fastapi.exceptions import (
     FastAPIError,
     RequestValidationError,
-    RouteAlreadyExistsError,
     ResponseValidationError,
+    RouteAlreadyExistsError,
     WebSocketRequestValidationError,
 )
 from fastapi.types import DecoratedCallable, IncEx