diff --git a/Filter/Widget/Dynamic/MultiDynamicAggregate.php b/Filter/Widget/Dynamic/MultiDynamicAggregate.php
index 70f39897..50f3e5c0 100644
--- a/Filter/Widget/Dynamic/MultiDynamicAggregate.php
+++ b/Filter/Widget/Dynamic/MultiDynamicAggregate.php
@@ -131,7 +131,7 @@ protected function isChoiceActive($key, ViewData $data, $activeName)
      *
      * @return BoolQuery
      */
-    private function getFilterQuery($terms)
+    protected function getFilterQuery($terms)
     {
         list($path, $field) = explode('>', $this->getDocumentField());
         $boolQuery = new BoolQuery();