diff --git a/lib/DigestSender.php b/lib/DigestSender.php
index a5338d9a4..14f6ce95f 100644
--- a/lib/DigestSender.php
+++ b/lib/DigestSender.php
@@ -178,7 +178,7 @@ public function sendDigestForUser(string $uid, int $now, string $timezone, strin
 			'activityEvents' => $activities,
 			'skippedCount' => $skippedCount,
 		]);
-		$template->setSubject($l10n->t('Daily activity summary for ' . $this->defaults->getName()));
+		$template->setSubject($l10n->t('Daily activity summary for %s', $this->defaults->getName()));
 		$template->addHeader();
 
 		foreach ($activities as $event) {