diff --git a/module/VuFind/src/VuFind/RecordDriver/SolrDefault.php b/module/VuFind/src/VuFind/RecordDriver/SolrDefault.php
index 1d40ee493ba51c96efd371bd771464393bac6e7b..361f0cfe46065676a70ad77ea12ac4d52d210e12 100644
--- a/module/VuFind/src/VuFind/RecordDriver/SolrDefault.php
+++ b/module/VuFind/src/VuFind/RecordDriver/SolrDefault.php
@@ -1198,7 +1198,7 @@ class SolrDefault extends AbstractBase
     public function getRealTimeHoldings()
     {
         // Not supported by the Solr index -- implement in child classes.
-        return [];
+        return ['holdings' => []];
     }
 
     /**