diff --git a/stdlib/sys.pyi b/stdlib/sys.pyi
index 0c4cf5be3..a6e10affc 100644
--- a/stdlib/sys.pyi
+++ b/stdlib/sys.pyi
@@ -301,6 +301,7 @@ if sys.version_info >= (3, 8):
         err_msg: str | None
         object: _object | None
     unraisablehook: Callable[[UnraisableHookArgs], Any]
+    def __unraisablehook__(__unraisable: UnraisableHookArgs) -> Any: ...
     def addaudithook(hook: Callable[[str, tuple[Any, ...]], Any]) -> None: ...
     def audit(__event: str, *args: Any) -> None: ...