diff --git a/stdlib/3/compileall.pyi b/stdlib/3/compileall.pyi
index 3be83d5cc..b0376bcd5 100644
--- a/stdlib/3/compileall.pyi
+++ b/stdlib/3/compileall.pyi
@@ -26,6 +26,7 @@ if sys.version_info >= (3, 9):
         stripdir: Optional[str] = ...,  # TODO: change to Optional[AnyPath] once https://bugs.python.org/issue40447 is resolved
         prependdir: Optional[AnyPath] = ...,
         limit_sl_dest: Optional[AnyPath] = ...,
+        hardlink_dupes: bool = ...,
     ) -> _SuccessType: ...
     def compile_file(
         fullname: AnyPath,
@@ -40,6 +41,7 @@ if sys.version_info >= (3, 9):
         stripdir: Optional[str] = ...,  # TODO: change to Optional[AnyPath] once https://bugs.python.org/issue40447 is resolved
         prependdir: Optional[AnyPath] = ...,
         limit_sl_dest: Optional[AnyPath] = ...,
+        hardlink_dupes: bool = ...,
     ) -> _SuccessType: ...
 elif sys.version_info >= (3, 7):
     def compile_dir(