diff --git a/systems/zeus/configuration.nix b/systems/zeus/configuration.nix
index 49c64c0..1056824 100644
--- a/systems/zeus/configuration.nix
+++ b/systems/zeus/configuration.nix
@@ -9,13 +9,19 @@
     ../../modules/smartd.nix
   ];
 
-  boot.loader.grub.enable = true;
-  boot.loader.grub.zfsSupport = true;
-  boot.kernelPackages = config.boot.zfs.package.latestCompatibleLinuxPackages;
-  boot.loader.grub.devices =
-    [ "/dev/sda" "/dev/sdb" "/dev/sdc" "/dev/sdd" "/dev/sde" "/dev/sdf" ];
+  boot.loader.efi.canTouchEfiVariables = false;
+  boot.loader.grub = {
+    enable = true;
+    efiSupport = true;
+    device = "nodev";
+    mirroredBoots = [{
+      path = "/boot-spare";
+      devices =
+        [ "/dev/disk/by-id/ata-WDC_WD10EFRX-68FYTN0_WD-WCC4J0KJRXHJ-part1" ];
+    }];
+  };
 
-  boot.supportedFilesystems = [ "vfat" ];
+  boot.kernelPackages = config.boot.zfs.package.latestCompatibleLinuxPackages;
 
   networking.hostName = "zeus"; # Define your hostname.
   networking.hostId = "9e95b576";