diff --git a/src/js/parser/javascript/base.js b/src/js/parser/javascript/base.js
index 5b25b8e..23fb0ed 100644
--- a/src/js/parser/javascript/base.js
+++ b/src/js/parser/javascript/base.js
@@ -11,7 +11,8 @@ export default {
   },
 
   renderLabel(container, text) {
-    var group = container.group();
+    var group = container.group()
+      .addClass('label');
 
     group.rect();