diff --git a/fastapi/routing.py b/fastapi/routing.py
index 2f0dcc5268..e791f7bba9 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -99,7 +99,6 @@ def request_response(
     Takes a function or coroutine `func(request) -> response`,
     and returns an ASGI application.
     """
-    f: Callable[[Request], Awaitable[Response]] = (
     f: Callable[[Request], Awaitable[Response]] = (
         func  # type: ignore[assignment]  # ty: ignore[unused-ignore-comment]
         if is_async_callable(func)