diff --git a/mod/forum/templates/forum_actionbar.mustache b/mod/forum/templates/forum_actionbar.mustache
index 47221f9d848..f8c59e4bf99 100644
--- a/mod/forum/templates/forum_actionbar.mustache
+++ b/mod/forum/templates/forum_actionbar.mustache
@@ -50,7 +50,7 @@
 }}
 
 <div class="container-fluid tertiary-navigation">
-    <div class="d-flex">
+    <div class="d-flex flex-wrap">
         <div class="navitem">
             {{> mod_forum/quick_search_form }}
         </div>