diff --git a/lib/Notification/Notifier.php b/lib/Notification/Notifier.php
index fec28aebe..dbba06332 100644
--- a/lib/Notification/Notifier.php
+++ b/lib/Notification/Notifier.php
@@ -16,6 +16,7 @@
 use OCP\Notification\AlreadyProcessedException;
 use OCP\Notification\INotification;
 use OCP\Notification\INotifier;
+use OCP\Notification\UnknownNotificationException;
 
 class Notifier implements INotifier {
 	/** @var IFactory */
@@ -77,7 +78,7 @@ public function getName(): string {
 	public function prepare(INotification $notification, string $languageCode): INotification {
 		$l = $this->l10nFactory->get('deck', $languageCode);
 		if ($notification->getApp() !== 'deck') {
-			throw new \InvalidArgumentException();
+			throw new UnknownNotificationException();
 		}
 		$notification->setIcon($this->url->getAbsoluteURL($this->url->imagePath('deck', 'deck-dark.svg')));
 		$params = $notification->getSubjectParameters();