diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index 76fb398e2..b23016bd3 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -6506,7 +6506,7 @@ mrb_parser_dump(mrb_state *mrb, node *tree, int offset)
     break;
 
   case NODE_HEREDOC:
-    printf("NODE_HEREDOC:\n");
+    printf("NODE_HEREDOC (<<%s):\n", ((parser_heredoc_info*)tree)->term);
     mrb_parser_dump(mrb, ((parser_heredoc_info*)tree)->doc, offset+1);
     break;