diff --git a/extensions/tags/js/src/forum/addTagList.js b/extensions/tags/js/src/forum/addTagList.js
index d14f2e768c..c66a8204c8 100644
--- a/extensions/tags/js/src/forum/addTagList.js
+++ b/extensions/tags/js/src/forum/addTagList.js
@@ -59,6 +59,12 @@ export default function addTagList() {
 
     more.splice(0, 3).forEach(addTag);
 
+    // The current tag may have been excluded by the filters above (e.g. a
+    // secondary tag outside the 3 most discussed ones). Add it anyway: the
+    // nav SelectDropdown has no defaultLabel, so without an active item the
+    // mobile toolbar title would render blank.
+    if (currentTag && !items.has('tag' + currentTag.id())) addTag(currentTag);
+
     if (more.length) {
       items.add('moreTags', <LinkButton href={app.route('tags')}>{app.translator.trans('flarum-tags.forum.index.more_link')}</LinkButton>, -16);
     }