diff --git a/stdlib/signal.pyi b/stdlib/signal.pyi
index cbb7440b9..2e3ac5bf2 100644
--- a/stdlib/signal.pyi
+++ b/stdlib/signal.pyi
@@ -181,7 +181,7 @@ else:
 def strsignal(signalnum: _SIGNUM, /) -> str | None: ...
 def valid_signals() -> set[Signals]: ...
 def raise_signal(signalnum: _SIGNUM, /) -> None: ...
-def set_wakeup_fd(fd: int, *, warn_on_full_buffer: bool = ...) -> int: ...
+def set_wakeup_fd(fd: int, /, *, warn_on_full_buffer: bool = ...) -> int: ...
 
 if sys.version_info >= (3, 9):
     if sys.platform == "linux":