diff --git a/hosts/rpi4/configuration.nix b/hosts/rpi4/configuration.nix
index 1d5a585..db4c976 100644
--- a/hosts/rpi4/configuration.nix
+++ b/hosts/rpi4/configuration.nix
@@ -10,6 +10,11 @@
       ./hardware-configuration.nix
     ];
 
+  fileSystems = let
+    mounts = [ "/nix" "/" "/.btrfsroot" "/home" ];
+    fn = (x: { options = [ "compress=zstd" ];});
+  in lib.genAttrs mounts fn;
+
   # Use the extlinux boot loader. (NixOS wants to enable GRUB by default)
   boot.loader.grub.enable = false;
   # Enables the generation of /boot/extlinux/extlinux.conf
diff --git a/hosts/rpi4/hardware-configuration.nix b/hosts/rpi4/hardware-configuration.nix
index 8aaa767..0a5949b 100644
--- a/hosts/rpi4/hardware-configuration.nix
+++ b/hosts/rpi4/hardware-configuration.nix
@@ -13,6 +13,12 @@
   boot.kernelModules = [ ];
   boot.extraModulePackages = [ ];
 
+  fileSystems."/.btrfsroot" =
+    { device = "/dev/disk/by-uuid/112535b6-4318-4d26-812b-7baf0d65dae5";
+      fsType = "btrfs";
+      options = [ "subvol=/" ];
+    };
+
   fileSystems."/" =
     { device = "/dev/disk/by-uuid/112535b6-4318-4d26-812b-7baf0d65dae5";
       fsType = "btrfs";