diff --git a/Include/Python-ast.h b/Include/Python-ast.h
index 52ba127..8265bed 100644
--- a/Include/Python-ast.h
+++ b/Include/Python-ast.h
@@ -703,6 +703,7 @@
 
 PyObject* PyAST_mod2obj(mod_ty t);
 mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode);
+mod_ty PyAST_obj2mod_ex(PyObject* ast, PyArena* arena, int mode, int feature_version);
 int PyAST_Check(PyObject* obj);
 
 #ifdef __cplusplus