diff --git a/fastapi/middleware/asyncexitstack.py b/fastapi/middleware/asyncexitstack.py
index 30a0ae626..7d34aa9ed 100644
--- a/fastapi/middleware/asyncexitstack.py
+++ b/fastapi/middleware/asyncexitstack.py
@@ -1,6 +1,6 @@
+from contextlib import AsyncExitStack
 from typing import Optional
 
-from fastapi.concurrency import AsyncExitStack
 from starlette.types import ASGIApp, Receive, Scope, Send