diff --git a/module/VuFind/src/VuFind/AjaxHandler/GetSideFacets.php b/module/VuFind/src/VuFind/AjaxHandler/GetSideFacets.php
index 37fb577e70f..a41db1daafb 100644
--- a/module/VuFind/src/VuFind/AjaxHandler/GetSideFacets.php
+++ b/module/VuFind/src/VuFind/AjaxHandler/GetSideFacets.php
@@ -234,6 +234,7 @@ protected function formatFacets(
             } else {
                 $context['facet'] = $facet;
                 $context['cluster'] = $facetSet[$facet] ?? [
+                    'label' => $results->getParams()->getFacetLabel($facet),
                     'list' => [],
                 ];
                 $context['collapsedFacets'] = [];