diff --git a/extensions/mentions/js/src/forum/addComposerAutocomplete.js b/extensions/mentions/js/src/forum/addComposerAutocomplete.js
index 378f2cbed..da9f9b48d 100644
--- a/extensions/mentions/js/src/forum/addComposerAutocomplete.js
+++ b/extensions/mentions/js/src/forum/addComposerAutocomplete.js
@@ -205,7 +205,7 @@ export default function addComposerAutocomplete() {
 
   extend(TextEditor.prototype, 'toolbarItems', function(items) {
     items.add('mention', (
-      <TextEditorButton onclick={() => this.props.composer.editor.insertAtCursor('@')} icon="fas fa-at">
+      <TextEditorButton onclick={() => this.attrs.composer.editor.insertAtCursor('@')} icon="fas fa-at">
         {app.translator.trans('flarum-mentions.forum.composer.mention_tooltip')}
       </TextEditorButton>
     ));