diff --git a/machines/desko/fs.nix b/machines/desko/fs.nix
index 88c1c408..8d023c1d 100644
--- a/machines/desko/fs.nix
+++ b/machines/desko/fs.nix
@@ -1,7 +1,7 @@
-{ lib, ... }:
+{ ... }:
 
 {
-  fileSystems."/" = lib.mkDefault {
+  fileSystems."/" = {
     device = "/dev/disk/by-uuid/985a0a32-da52-4043-9df7-615adec2e4ff";
     fsType = "btrfs";
     options = [
@@ -11,7 +11,7 @@
   };
 
   fileSystems."/boot" = {
-    device = lib.mkDefault "/dev/disk/by-uuid/CAA7-E7D2";
+    device = "/dev/disk/by-uuid/CAA7-E7D2";
     fsType = "vfat";
   };
 }
diff --git a/machines/lappy/fs.nix b/machines/lappy/fs.nix
index 1f8bd961..af97910f 100644
--- a/machines/lappy/fs.nix
+++ b/machines/lappy/fs.nix
@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ ... }:
 
 {
   fileSystems."/" = {
@@ -21,7 +21,7 @@
   };
 
   fileSystems."/boot" = {
-    device = lib.mkDefault "/dev/disk/by-uuid/BD79-D6BB";
+    device = "/dev/disk/by-uuid/BD79-D6BB";
     fsType = "vfat";
   };
 
diff --git a/machines/moby/fs.nix b/machines/moby/fs.nix
index 7e13de1c..254a6c0e 100644
--- a/machines/moby/fs.nix
+++ b/machines/moby/fs.nix
@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ ... }:
 
 {
   fileSystems."/" = {
@@ -11,7 +11,7 @@
   };
 
   fileSystems."/boot" = {
-    device = lib.mkDefault "/dev/disk/by-uuid/0299-F1E5";
+    device = "/dev/disk/by-uuid/0299-F1E5";
     fsType = "vfat";
   };
 }
diff --git a/machines/servo/fs.nix b/machines/servo/fs.nix
index b682d3f8..67e7c5b3 100644
--- a/machines/servo/fs.nix
+++ b/machines/servo/fs.nix
@@ -1,12 +1,12 @@
-{ lib, ... }:
+{ ... }:
 
 {
-  fileSystems."/" = lib.mkDefault {
+  fileSystems."/" = {
     device = "/dev/disk/by-uuid/2be70d38-79f4-41b6-bee2-bce5a25f8f7b";
     fsType = "ext4";
   };
   fileSystems."/boot" = {
-    device = lib.mkDefault "/dev/disk/by-uuid/B318-A67E";
+    device = "/dev/disk/by-uuid/B318-A67E";
     fsType = "vfat";
   };