Prevent regeneration.
diff --git a/Include/Python-ast.h b/Include/Python-ast.h
index 66d7b52..a702dbc 100644
--- a/Include/Python-ast.h
+++ b/Include/Python-ast.h
@@ -516,3 +516,4 @@
 alias_ty _Py_alias(identifier name, identifier asname, PyArena *arena);
 
 PyObject* PyAST_mod2obj(mod_ty t);
+