diff --git a/app/assets/javascripts/discourse/app/components/discourse-root.js b/app/assets/javascripts/discourse/app/components/discourse-root.js
index e3d691f0531..c1c6ac93a24 100644
--- a/app/assets/javascripts/discourse/app/components/discourse-root.js
+++ b/app/assets/javascripts/discourse/app/components/discourse-root.js
@@ -1,6 +1,6 @@
 import Component from "@ember/component";
 
-let componentArgs = { tagName: "div" };
+let componentArgs = { tagName: "div", classNames: ["discourse-root"] };
 
 // TODO: Once we've moved to Ember CLI completely we can remove this block
 // eslint-disable-next-line no-undef