diff --git a/stdlib/array.pyi b/stdlib/array.pyi
index aad22142de67..e84456049df6 100644
--- a/stdlib/array.pyi
+++ b/stdlib/array.pyi
@@ -56,7 +56,7 @@ class array(MutableSequence[_T], Generic[_T]):
     def tolist(self) -> list[_T]: ...
     def tounicode(self) -> str: ...
     if sys.version_info < (3, 9):
-        def fromstring(self, __buffer: bytes) -> None: ...
+        def fromstring(self, __buffer: str | ReadableBuffer) -> None: ...
         def tostring(self) -> bytes: ...
 
     def __len__(self) -> int: ...