diff --git a/stdlib/2/ast.pyi b/stdlib/2/ast.pyi
index e4ba3b6f1..8261a5ef2 100644
--- a/stdlib/2/ast.pyi
+++ b/stdlib/2/ast.pyi
@@ -1,7 +1,7 @@
 # Python 2.7 ast
 
 import typing
-from typing import Any, Iterator, Union
+from typing import Any, Iterator, Optional, Union
 
 from _ast import *
 from _ast import AST, Module
@@ -23,7 +23,7 @@ def walk(node: AST) -> Iterator[AST]: ...
 
 class NodeVisitor():
     def visit(self, node: AST) -> Any: ...
-    def generic_visit(self, node: AST) -> None: ...
+    def generic_visit(self, node: AST) -> Any: ...
 
 class NodeTransformer(NodeVisitor):
-    def generic_visit(self, node: AST) -> None: ...
+    def generic_visit(self, node: AST) -> Optional[AST]: ...