diff --git a/library/Icingadb/Widget/Detail/DowntimeDetail.php b/library/Icingadb/Widget/Detail/DowntimeDetail.php
index 4ca447a8..fbeb0692 100644
--- a/library/Icingadb/Widget/Detail/DowntimeDetail.php
+++ b/library/Icingadb/Widget/Detail/DowntimeDetail.php
@@ -54,7 +54,7 @@ class DowntimeDetail extends BaseHtmlElement
     protected function createCancelDowntimeForm()
     {
         $action = Links::downtimesDelete();
-        $action->setParam('name', $this->downtime->name);
+        $action->setQueryString(QueryString::render(Filter::equal('name', $this->downtime->name)));
 
         return (new DeleteDowntimeForm())
             ->setObjects([$this->downtime])