diff --git a/apps/dav/lib/CalDAV/Activity/Backend.php b/apps/dav/lib/CalDAV/Activity/Backend.php
index 9f929dc195b77..303ab8cc029b0 100644
--- a/apps/dav/lib/CalDAV/Activity/Backend.php
+++ b/apps/dav/lib/CalDAV/Activity/Backend.php
@@ -27,6 +27,7 @@
 
 use OCA\DAV\CalDAV\Activity\Provider\Calendar;
 use OCA\DAV\CalDAV\Activity\Provider\Event;
+use OCA\DAV\CalDAV\CalDavBackend;
 use OCP\Activity\IEvent;
 use OCP\Activity\IManager as IActivityManager;
 use OCP\IGroup;
@@ -415,6 +416,8 @@ public function onTouchCalendarObject($action, array $calendarData, array $share
 			$currentUser = $owner;
 		}
 
+		$classification = (isset($objectData['classification']) ? $objectData['classification'] : CalDavBackend::CLASSIFICATION_PUBLIC);
+		
 		$object = $this->getObjectNameAndType($objectData);
 		$action = $action . '_' . $object['type'];
 
@@ -434,6 +437,9 @@ public function onTouchCalendarObject($action, array $calendarData, array $share
 		$users[] = $owner;
 
 		foreach ($users as $user) {
+			if ($classification !== CalDavBackend::CLASSIFICATION_PUBLIC && $user !== $owner) {
+				continue;
+			}
 			$event->setAffectedUser($user)
 				->setSubject(
 					$user === $currentUser ? $action . '_self' : $action,