diff --git a/stdlib/3/argparse.pyi b/stdlib/3/argparse.pyi
index b30240c71..3e97ef1c8 100644
--- a/stdlib/3/argparse.pyi
+++ b/stdlib/3/argparse.pyi
@@ -106,6 +106,7 @@ class Namespace(_AttributeHolder):
     def __ne__(self, other): ...
     def __contains__(self, key): ...
     def __getitem__(self, key: str) -> Any: ...
+    def __getattr__(self, name: str) -> Any: ...
 
 class _ActionsContainer:
     description = ... # type: Any