diff --git a/roles/lego/files/lego-renew.timer b/roles/lego/files/lego-renew.timer
index 27ee2dd..d5e28ca 100644
--- a/roles/lego/files/lego-renew.timer
+++ b/roles/lego/files/lego-renew.timer
@@ -3,7 +3,7 @@ Description=Periodically renew certificates with LEGO
 
 [Timer]
 RandomizedDelaySec=15m
-OnActiveSec=4h
+OnCalendar=*-*-* 00/4:00:00
 
 [Install]
 WantedBy=timers.target