diff --git a/starlette/middleware/base.py b/starlette/middleware/base.py
index 175ffc1f4..6e37c6f60 100644
--- a/starlette/middleware/base.py
+++ b/starlette/middleware/base.py
@@ -3,7 +3,6 @@
 import typing
 
 import anyio
-from anyio.streams.memory import MemoryObjectReceiveStream, MemoryObjectSendStream
 
 from starlette._utils import collapse_excgroups
 from starlette.requests import ClientDisconnect, Request