diff --git a/stdlib/atexit.pyi b/stdlib/atexit.pyi
index ea041d7b5..7f7b05ccc 100644
--- a/stdlib/atexit.pyi
+++ b/stdlib/atexit.pyi
@@ -8,5 +8,5 @@ _P = ParamSpec("_P")
 def _clear() -> None: ...
 def _ncallbacks() -> int: ...
 def _run_exitfuncs() -> None: ...
-def register(func: Callable[_P, _T], *args: _P.args, **kwargs: _P.kwargs) -> Callable[_P, _T]: ...
-def unregister(func: Callable[..., object]) -> None: ...
+def register(func: Callable[_P, _T], /, *args: _P.args, **kwargs: _P.kwargs) -> Callable[_P, _T]: ...
+def unregister(func: Callable[..., object], /) -> None: ...