diff --git a/screenshot.timer b/screenshot.timer
index 9b9e805..a545ace 100644
--- a/screenshot.timer
+++ b/screenshot.timer
@@ -2,8 +2,8 @@
 Description=Take a screenshot every minute
 
 [Timer]
-OnBootSec=1min
-OnUnitActiveSec=1min
+OnCalendar=*:*:00
+OnCalendar=*:*:30
 Persistent=true
 
 [Install]