diff --git a/fastapi_async_sqlalchemy/middleware.py b/fastapi_async_sqlalchemy/middleware.py
index 1a407fa..bb6024d 100644
--- a/fastapi_async_sqlalchemy/middleware.py
+++ b/fastapi_async_sqlalchemy/middleware.py
@@ -51,7 +51,7 @@ def __init__(
             )
 
         async def dispatch(self, request: Request, call_next: RequestResponseEndpoint):
-            async with db(commit_on_exit=self.commit_on_exit):
+            async with DBSession(commit_on_exit=self.commit_on_exit):
                 return await call_next(request)
 
     class DBSessionMeta(type):