diff --git a/config/vm-guest.nix b/config/vm-guest.nix
index 9e8266f..58fda5c 100644
--- a/config/vm-guest.nix
+++ b/config/vm-guest.nix
@@ -1,4 +1,4 @@
-{ pkgs, ... }:
+{ pkgs, lib, ... }:
 
 let
   spice-vdagent-desktop = pkgs.makeDesktopItem {
@@ -27,6 +27,8 @@ in
   services.gvfs.enable = true;
   services.qemuGuest.enable = true;
 
+  networking.hostName = lib.mkForce "cesium-vm";
+
   # Open ports in the firewall.
   networking.firewall.allowedTCPPorts = [ 9843 22 ];
   # Enable the OpenSSH daemon.