diff --git a/node.h b/node.h
index b6fefb4410..bc0dcb26c5 100644
--- a/node.h
+++ b/node.h
@@ -401,7 +401,6 @@ typedef struct rb_ast_body_struct {
 typedef struct rb_ast_struct {
     VALUE flags;
     node_buffer_t *node_buffer;
-    ID *local_lists;
     rb_ast_body_t body;
 } rb_ast_t;
 rb_ast_t *rb_ast_new(void);