diff --git a/stdlib/keyword.pyi b/stdlib/keyword.pyi
index 5eb7aab85..960dfd2fa 100644
--- a/stdlib/keyword.pyi
+++ b/stdlib/keyword.pyi
@@ -7,14 +7,14 @@ if sys.version_info >= (3, 9):
 else:
     __all__ = ["iskeyword", "kwlist"]
 
-def iskeyword(s: str) -> bool: ...
+def iskeyword(s: str, /) -> bool: ...
 
 # a list at runtime, but you're not meant to mutate it;
 # type it as a sequence
 kwlist: Final[Sequence[str]]
 
 if sys.version_info >= (3, 9):
-    def issoftkeyword(s: str) -> bool: ...
+    def issoftkeyword(s: str, /) -> bool: ...
 
     # a list at runtime, but you're not meant to mutate it;
     # type it as a sequence