diff --git a/hosts/ornithologist/default.nix b/hosts/ornithologist/default.nix
index cf5a546..71a8d70 100644
--- a/hosts/ornithologist/default.nix
+++ b/hosts/ornithologist/default.nix
@@ -1,4 +1,15 @@
 {pkgs, ...}: {
+  # Root filesystem.
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/11bdddf2-82b9-473d-b2ac-3b58f9f93ee7";
+      fsType = "ext4";
+    };
+
+  # Swap.
+  swapDevices =
+    [ { device = "/dev/disk/by-uuid/2fd2d201-14a2-45f8-abef-a1e57a509fe4"; }
+    ];
+
   # Install some packages.
   environment.systemPackages = with pkgs; [
     deploy-rs