diff --git a/stdlib/2/ast.pyi b/stdlib/2/ast.pyi
index aff644337..e4ba3b6f1 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, TypeVar, Union
+from typing import Any, Iterator, Union
 
 from _ast import *
 from _ast import AST, Module
@@ -9,7 +9,6 @@ from _ast import AST, Module
 __version__ = ...  # type: str
 PyCF_ONLY_AST = ...  # type: int
 
-_T = TypeVar('_T', bound=AST)
 
 def parse(source: Union[str, unicode], filename: Union[str, unicode] = ..., mode: Union[str, unicode] = ...) -> Module: ...
 def copy_location(new_node: AST, old_node: AST) -> AST: ...
@@ -27,4 +26,4 @@ class NodeVisitor():
     def generic_visit(self, node: AST) -> None: ...
 
 class NodeTransformer(NodeVisitor):
-    def generic_visit(self, node: _T) -> _T: ...
+    def generic_visit(self, node: AST) -> None: ...
diff --git a/stdlib/3/ast.pyi b/stdlib/3/ast.pyi
index 69999dcac..241f874f1 100644
--- a/stdlib/3/ast.pyi
+++ b/stdlib/3/ast.pyi
@@ -1,18 +1,16 @@
 # Python 3.5 ast
 
 import typing
-from typing import Any, Union, TypeVar, Iterator
+from typing import Any, Union, Iterator
 
 from _ast import *
 
-_T = TypeVar('_T', bound=AST)
-
 class NodeVisitor():
     def visit(self, node: AST) -> Any: ...
     def generic_visit(self, node: AST) -> None: ...
 
 class NodeTransformer(NodeVisitor):
-    def generic_visit(self, node: _T) -> _T: ...
+    def generic_visit(self, node: AST) -> None: ...
 
 def parse(source: Union[str, bytes], filename: Union[str, bytes] = ..., mode: str = ...) -> Module: ...
 def copy_location(new_node: AST, old_node: AST) -> AST: ...