diff --git a/etc/systemd/system/restic-backup.timer b/etc/systemd/system/restic-backup.timer
index 67f2d83..ab07b3a 100644
--- a/etc/systemd/system/restic-backup.timer
+++ b/etc/systemd/system/restic-backup.timer
@@ -5,7 +5,7 @@ Requires=restic-backup.service
 [Timer]
 Unit=restic-backup.service
 OnCalendar=*-*-* 22:40:00
-Persistent=yes
+Persistent=true
 
 [Install]
 WantedBy=timers.target