diff --git a/extensions/mentions/js/src/forum/utils/reply.js b/extensions/mentions/js/src/forum/utils/reply.js
index 2355641b5..12c79b883 100644
--- a/extensions/mentions/js/src/forum/utils/reply.js
+++ b/extensions/mentions/js/src/forum/utils/reply.js
@@ -4,7 +4,7 @@ import cleanDisplayName from './cleanDisplayName';
 
 function insertMention(post, composer, quote) {
   const user = post.user();
-  const mention = `@"${(user && cleanDisplayName(user)) || app.translator.trans('core.lib.username.deleted_text')}"#p${post.id()}`;
+  const mention = `@"${(user && cleanDisplayName(user)) || app.translator.trans('core.lib.username.deleted_text')}"#p${post.id()} `;
 
   // If the composer is empty, then assume we're starting a new reply.
   // In which case we don't want the user to have to confirm if they