diff --git a/app/assets/javascripts/discourse/app/widgets/post.js b/app/assets/javascripts/discourse/app/widgets/post.js
index ea8870e56b4..e88190aea12 100644
--- a/app/assets/javascripts/discourse/app/widgets/post.js
+++ b/app/assets/javascripts/discourse/app/widgets/post.js
@@ -163,6 +163,7 @@ createWidget("reply-to-tab", {
     };
 
     if (!this.attrs.mobileView) {
+      result["role"] = "button";
       result["aria-controls"] = `embedded-posts__top--${attrs.post_number}`;
       result["aria-expanded"] = this.attrs.repliesAbove.length
         ? "true"