diff --git a/src/filelock/read_write/asyncio/_api.py b/src/filelock/read_write/asyncio/_api.py
index ff88273..1148d96 100644
--- a/src/filelock/read_write/asyncio/_api.py
+++ b/src/filelock/read_write/asyncio/_api.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import asyncio
+import contextlib
 import time
 from pathlib import Path
 from typing import TYPE_CHECKING, NoReturn, cast