diff --git a/backup.nix b/backup.nix
index 950f5c0..f42011a 100644
--- a/backup.nix
+++ b/backup.nix
@@ -67,9 +67,9 @@ in
         RandomizedDelaySec = cfg.randomized-delay;
       };
     };
-    systemd.units."backup-helper@etc-machine\x2did.timer" = {
-      enable = true;
+    systemd.timers."backup-helper@etc-machine\x2did" = {
       wantedBy = [ "timers.target" ];
+      overrideStrategy = "asDropin";
     };
   };
 }