diff --git a/modules/periodic.nix b/modules/periodic.nix
index 0ff5b51..76eab23 100644
--- a/modules/periodic.nix
+++ b/modules/periodic.nix
@@ -42,9 +42,10 @@ in {
         ${pkgs.bash}/bin/bash -c "/etc/nixos/scripts/SATA-hat.sh off"
       '';
     };
-    before = [ "zfs-import.target" "zfs-import-vault.service" ];
+    before = [ "zfs-import.target" "zfs-import-vault.service" "umount.target" ];
     requires = [ "systemd-udev-settle.service" ];
     after = [ "systemd-udev-settle.service" ];
+    conflicts = [ "umount.target" ];
   };
 
   # HACK: restart services dependent on ZFS afer mount