diff --git a/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php b/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
index e01eab33206a..3c4967748b9f 100644
--- a/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
+++ b/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php
@@ -122,6 +122,7 @@ public function schedule(ITip\Message $iTipMessage) {
 		$message = $this->mailer->createMessage();
 
 		$message->setReplyTo([$sender => $senderName])
+			->setFrom([$sender => $senderName])
 			->setTo([$recipient => $recipientName])
 			->setSubject($subject)
 			->setBody($iTipMessage->message->serialize(), $contentType);