diff --git a/lib/CalDAV/Schedule/Plugin.php b/lib/CalDAV/Schedule/Plugin.php
index 5e56596101..9272e1e555 100644
--- a/lib/CalDAV/Schedule/Plugin.php
+++ b/lib/CalDAV/Schedule/Plugin.php
@@ -389,7 +389,7 @@ public function beforeUnbind($path)
             $node->getOwner()
         );
 
-        $broker = new ITip\Broker();
+        $broker = $this->createITipBroker();
         $messages = $broker->parseEvent(null, $addresses, $node->get());
 
         foreach ($messages as $message) {
@@ -500,7 +500,7 @@ public function scheduleLocalDelivery(ITip\Message $iTipMessage)
             $isNewNode = true;
         }
 
-        $broker = new ITip\Broker();
+        $broker = $this->createITipBroker();
         $newObject = $broker->processMessage($iTipMessage, $currentObject);
 
         $inbox->createFile($newFileName, $iTipMessage->message->serialize());
@@ -611,7 +611,7 @@ public function getSupportedPrivilegeSet(INode $node, array &$supportedPrivilege
      */
     protected function processICalendarChange($oldObject, VCalendar $newObject, array $addresses, array $ignore = [], &$modified = false)
     {
-        $broker = new ITip\Broker();
+        $broker = $this->createITipBroker();
         $messages = $broker->parseEvent($newObject, $addresses, $oldObject);
 
         if ($messages) {
@@ -994,4 +994,14 @@ public function getPluginInfo()
             'link' => 'http://sabre.io/dav/scheduling/',
         ];
     }
+
+    /**
+     * Returns an instance of the iTip\Broker
+     * 
+     * @return Broker
+     */
+    protected function createITipBroker()
+    {
+        return new ITip\Broker();
+    }
 }