diff --git a/ext/objspace/objspace.c b/ext/objspace/objspace.c
index f7d77f355d..3e73d4637f 100644
--- a/ext/objspace/objspace.c
+++ b/ext/objspace/objspace.c
@@ -442,7 +442,6 @@ count_nodes(int argc, VALUE *argv, VALUE os)
 		COUNT_NODE(NODE_ARGSCAT);
 		COUNT_NODE(NODE_ARGSPUSH);
 		COUNT_NODE(NODE_SPLAT);
-		COUNT_NODE(NODE_BLOCK_ARG);
 		COUNT_NODE(NODE_BLOCK_PASS);
 		COUNT_NODE(NODE_DEFN);
 		COUNT_NODE(NODE_DEFS);
diff --git a/node.c b/node.c
index 511255db4e..af7690fc01 100644
--- a/node.c
+++ b/node.c
@@ -1035,7 +1035,6 @@ dump_node(VALUE buf, VALUE indent, int comment, NODE *node)
 	return;
 
       case NODE_ARGS_AUX:
-      case NODE_BLOCK_ARG:
       case NODE_BMETHOD:
       case NODE_LAST:
 	break;
@@ -1209,7 +1208,6 @@ rb_gc_mark_node(NODE *obj)
       case NODE_TRUE:
       case NODE_FALSE:
       case NODE_ERRINFO:
-      case NODE_BLOCK_ARG:
 	break;
 
       default:		/* unlisted NODE */
diff --git a/node.h b/node.h
index 9fc4b47285..ae8595338d 100644
--- a/node.h
+++ b/node.h
@@ -168,8 +168,6 @@ enum node_type {
 #define NODE_ARGSPUSH    NODE_ARGSPUSH
     NODE_SPLAT,
 #define NODE_SPLAT       NODE_SPLAT
-    NODE_BLOCK_ARG,
-#define NODE_BLOCK_ARG   NODE_BLOCK_ARG
     NODE_BLOCK_PASS,
 #define NODE_BLOCK_PASS  NODE_BLOCK_PASS
     NODE_DEFN,
@@ -424,7 +422,6 @@ typedef struct RNode {
 #define NEW_ARGSCAT(a,b) NEW_NODE(NODE_ARGSCAT,a,b,0)
 #define NEW_ARGSPUSH(a,b) NEW_NODE(NODE_ARGSPUSH,a,b,0)
 #define NEW_SPLAT(a) NEW_NODE(NODE_SPLAT,a,0,0)
-#define NEW_BLOCK_ARG(v) NEW_NODE(NODE_BLOCK_ARG,v,0,local_cnt(v))
 #define NEW_BLOCK_PASS(b) NEW_NODE(NODE_BLOCK_PASS,0,b,0)
 #define NEW_ALIAS(n,o) NEW_NODE(NODE_ALIAS,n,o,0)
 #define NEW_VALIAS(n,o) NEW_NODE(NODE_VALIAS,n,o,0)