diff --git a/lib/Dashboard/MailWidget.php b/lib/Dashboard/MailWidget.php
index a26e831ee4..fdf637bbed 100644
--- a/lib/Dashboard/MailWidget.php
+++ b/lib/Dashboard/MailWidget.php
@@ -129,6 +129,7 @@ public function getItems(string $userId, ?string $since = null, int $limit = 7):
 		$intSince = $since === null ? null : (int)$since;
 		$emails = $this->getEmails($userId, $intSince, $limit);
 
+		/** @var list<WidgetItem> */
 		return array_map(function (Message $email) {
 			$firstFrom = $email->getFrom()->first();
 			return new WidgetItem(