diff --git a/fastapi/applications.py b/fastapi/applications.py
index fe26a8309..08fbf4d85 100644
--- a/fastapi/applications.py
+++ b/fastapi/applications.py
@@ -25,7 +25,7 @@ from fastapi.exception_handlers import (
 from fastapi.exceptions import (
     RequestMalformedError,
     RequestValidationError,
-    WebSocketRequestValidationError
+    WebSocketRequestValidationError,
 )
 from fastapi.logger import logger
 from fastapi.middleware.asyncexitstack import AsyncExitStackMiddleware