diff --git a/lib/BackgroundJob.php b/lib/BackgroundJob.php
index a1c9a970..b2aa0fc0 100644
--- a/lib/BackgroundJob.php
+++ b/lib/BackgroundJob.php
@@ -123,6 +123,7 @@ protected function createPublicity(Announcement $announcement, array $publicity)
 		if (\in_array('everyone', $groups, true)) {
 			$this->createPublicityEveryone($announcement->getUser(), $event, $notification, $publicity);
 		} else {
+			$this->notifiedUsers = [];
 			$this->createPublicityGroups($announcement->getUser(), $event, $notification, $groups, $publicity);
 		}
 	}