diff --git a/stdlib/asyncio/threads.pyi b/stdlib/asyncio/threads.pyi
index 3f798d8ac..c13c0c6d1 100644
--- a/stdlib/asyncio/threads.pyi
+++ b/stdlib/asyncio/threads.pyi
@@ -1,7 +1,9 @@
 import sys
-from typing import Any, Callable, TypeVar
+from typing import Callable, TypeVar
+from typing_extensions import ParamSpec
 
-_T = TypeVar("_T")
+_P = ParamSpec("_P")
+_R = TypeVar("_R")
 
 if sys.version_info >= (3, 9):
-    async def to_thread(__func: Callable[..., _T], *args: Any, **kwargs: Any) -> _T: ...
+    async def to_thread(__func: Callable[_P, _R], *args: _P.args, **kwargs: _P.kwargs) -> _R: ...