diff --git a/parse.y b/parse.y
index 15d0efe257..6a224e2a14 100644
--- a/parse.y
+++ b/parse.y
@@ -11399,7 +11399,6 @@ rb_node_colon2_new(struct parser_params *p, NODE *nd_head, ID nd_mid, const YYLT
     rb_node_colon2_t *n = NODE_NEWNODE(NODE_COLON2, rb_node_colon2_t, loc);
     n->nd_head = nd_head;
     n->nd_mid = nd_mid;
-    n->not_used = 0;
 
     return n;
 }
@@ -11408,9 +11407,7 @@ static rb_node_colon3_t *
 rb_node_colon3_new(struct parser_params *p, ID nd_mid, const YYLTYPE *loc)
 {
     rb_node_colon3_t *n = NODE_NEWNODE(NODE_COLON3, rb_node_colon3_t, loc);
-    n->not_used = 0;
     n->nd_mid = nd_mid;
-    n->not_used2 = 0;
 
     return n;
 }
diff --git a/rubyparser.h b/rubyparser.h
index 0258528ed9..377d6d5be0 100644
--- a/rubyparser.h
+++ b/rubyparser.h
@@ -826,15 +826,12 @@ typedef struct RNode_COLON2 {
 
     struct RNode *nd_head;
     ID nd_mid;
-    VALUE not_used;
 } rb_node_colon2_t;
 
 typedef struct RNode_COLON3 {
     NODE node;
 
-    VALUE not_used;
     ID nd_mid;
-    VALUE not_used2;
 } rb_node_colon3_t;
 
 /* RNode_DOT2, RNode_DOT3, RNode_FLIP2 and RNode_FLIP3 should be same structure */