diff --git a/stdlib/2and3/threading.pyi b/stdlib/2and3/threading.pyi
index 58f11b67c..f81b708f4 100644
--- a/stdlib/2and3/threading.pyi
+++ b/stdlib/2and3/threading.pyi
@@ -44,7 +44,7 @@ if sys.version_info < (3,):
 # TODO: Change to a class with __getattr__ and __setattr__
 # once mypy supports universal __setattr__.
 # See https://github.com/python/mypy/issues/521
-local = None  # type: Any
+local = ...  # type: Any
 
 
 class Thread: