diff --git a/lib/CalDAV/Schedule/Plugin.php b/lib/CalDAV/Schedule/Plugin.php
index 9272e1e555..246a92c026 100644
--- a/lib/CalDAV/Schedule/Plugin.php
+++ b/lib/CalDAV/Schedule/Plugin.php
@@ -25,6 +25,7 @@
 use Sabre\VObject;
 use Sabre\VObject\Component\VCalendar;
 use Sabre\VObject\ITip;
+use Sabre\VObject\ITip\Broker;
 use Sabre\VObject\ITip\Message;
 use Sabre\VObject\Reader;
 
@@ -1000,8 +1001,8 @@ public function getPluginInfo()
      * 
      * @return Broker
      */
-    protected function createITipBroker()
+    protected function createITipBroker(): Broker
     {
-        return new ITip\Broker();
+        return new Broker();
     }
 }