diff --git a/builtins/2.7/_ast.pyi b/builtins/2.7/_ast.pyi
index 4fb5b5cfb..bd8d259e5 100644
--- a/builtins/2.7/_ast.pyi
+++ b/builtins/2.7/_ast.pyi
@@ -1,6 +1,8 @@
 from typing import Any
 from typing import Tuple as TypingTuple
 
+__version__ = ...  # type: int
+
 PyCF_ONLY_AST = ...  # type: int
 
 class AST(object):