diff --git a/extensions/mentions/js/src/post-reply-action.js b/extensions/mentions/js/src/post-reply-action.js
index 5edef4b61..14f196ab3 100644
--- a/extensions/mentions/js/src/post-reply-action.js
+++ b/extensions/mentions/js/src/post-reply-action.js
@@ -5,7 +5,7 @@ import CommentPost from 'flarum/components/comment-post';
 export default function() {
   extend(CommentPost.prototype, 'actionItems', function(items) {
     var post = this.props.post;
-    if (post.isHidden()) return;
+    if (post.isHidden() || (app.session.user() && !post.discussion().canReply())) return;
 
     function insertMention(component, quote) {
       var mention = '@'+post.user().username()+'#'+post.number()+' ';