diff --git a/systems/ceres/config/filesystem.nix b/systems/ceres/config/filesystem.nix
index 727ebba..3a4d3ca 100755
--- a/systems/ceres/config/filesystem.nix
+++ b/systems/ceres/config/filesystem.nix
@@ -8,46 +8,50 @@ let
   inherit (flake.config.people) user0;
 in
 {
-  fileSystems = {
-    "/" = {
-      device = "/dev/disk/by-uuid/8596aaba-338f-1f9d-ba9d-a63bcbc38523";
-      fsType = "btrfs";
-      options = [
-        "subvol=root"
-      ];
-    };
+  fileSystems =
+    let
+      rootDevice = "/dev/disk/by-uuid/8596aaba-338f-4f9d-ba9d-a63bcbc38523";
+    in
+    {
+      "/" = {
+        device = rootDevice;
+        fsType = "btrfs";
+        options = [
+          "subvol=root"
+        ];
+      };
 
-    "/nix" = {
-      device = "/dev/disk/by-uuid/8596aaba-338f-1f9d-ba9d-a63bcbc38523";
-      fsType = "btrfs";
-      options = [
-        "subvol=nix"
-      ];
-    };
+      "/nix" = {
+        device = rootDevice;
+        fsType = "btrfs";
+        options = [
+          "subvol=nix"
+        ];
+      };
 
-    "/persistent" = {
-      device = "/dev/disk/by-uuid/8596aaba-338f-1f9d-ba9d-a63bcbc38523";
-      fsType = "btrfs";
-      neededForBoot = true;
-      options = [
-        "subvol=persistent"
-      ];
-    };
+      "/persistent" = {
+        device = rootDevice;
+        fsType = "btrfs";
+        neededForBoot = true;
+        options = [
+          "subvol=persistent"
+        ];
+      };
 
-    "/boot" = {
-      device = "/dev/disk/by-uuid/7328-07C6";
-      fsType = "vfat";
-      options = [
-        "fmask=0077"
-        "dmask=0077"
-      ];
-    };
+      "/boot" = {
+        device = "/dev/disk/by-uuid/7328-07C6";
+        fsType = "vfat";
+        options = [
+          "fmask=0077"
+          "dmask=0077"
+        ];
+      };
 
-    "/mnt/storage" = {
-      device = "/dev/disk/by-label/storage";
-      fsType = "ext4";
+      "/mnt/storage" = {
+        device = "/dev/disk/by-label/storage";
+        fsType = "ext4";
+      };
     };
-  };
   boot.initrd.postResumeCommands = lib.mkAfter ''
     mkdir /btrfs_tmp
     mount -o subvolid=5 /dev/sdb2 /btrfs_tmp