diff --git a/modules/backend/widgets/filter/partials/_filter.htm b/modules/backend/widgets/filter/partials/_filter.htm
index 35f867595..4bec44577 100644
--- a/modules/backend/widgets/filter/partials/_filter.htm
+++ b/modules/backend/widgets/filter/partials/_filter.htm
@@ -1,5 +1,5 @@
 <div
-    class="control-filter"
+    class="control-filter <?= $cssClasses ?>"
     data-control="filterwidget"
     data-options-handler="<?= $this->getEventHandler('onFilterGetOptions') ?>"
     data-update-handler="<?= $this->getEventHandler('onFilterUpdate') ?>">