diff --git a/stdlib/importlib/util.pyi b/stdlib/importlib/util.pyi
index 04217f456..6608f70d4 100644
--- a/stdlib/importlib/util.pyi
+++ b/stdlib/importlib/util.pyi
@@ -40,4 +40,4 @@ class LazyLoader(importlib.abc.Loader):
     def factory(cls, loader: importlib.abc.Loader) -> Callable[..., LazyLoader]: ...
     def exec_module(self, module: types.ModuleType) -> None: ...
 
-def source_hash(source_bytes: ReadableBuffer) -> int: ...
+def source_hash(source_bytes: ReadableBuffer) -> bytes: ...