diff --git a/hosts/droppie/restic-backup.nix b/hosts/droppie/restic-backup.nix
index c449366c..70a1f0e5 100644
--- a/hosts/droppie/restic-backup.nix
+++ b/hosts/droppie/restic-backup.nix
@@ -45,7 +45,7 @@ in
   systemd.timers."shutdown-after-backup" = {
     enable = true;
     timerConfig = {
-      OnCalendar = "3..9:*";
+      OnCalendar = "3..9:* Etc/UTC";
     };
     wantedBy = [ "timers.target" ];
     partOf = [ "shutdown-after-backup.service" ];