diff --git a/flake.nix b/flake.nix
index 877dba0c..8a45b2a2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -163,6 +163,7 @@
         inherit system mylib;
         hostname = "nixinator";
         username = "christoph";
+        headless = false;
         extraModules = [
           # TODO:
           # inputs.nix-topology.nixosModules.default
@@ -172,6 +173,7 @@
         inherit system mylib;
         hostname = "nixtop";
         username = "christoph";
+        headless = false;
         extraModules = [
           # TODO:
           # inputs.nix-topology.nixosModules.default
diff --git a/lib/nixos.nix b/lib/nixos.nix
index 55743eb8..7967a132 100644
--- a/lib/nixos.nix
+++ b/lib/nixos.nix
@@ -10,12 +10,13 @@
     hostname,
     username,
     extraModules ? [],
+    headless ? false,
   }:
     lib.nixosSystem {
       inherit system;
 
       # Values in "specialArgs" are propagated to all system modules.
-      specialArgs = {inherit inputs hostname mylib system username;};
+      specialArgs = {inherit inputs hostname mylib system username headless;};
 
       modules = builtins.concatLists [
         [
@@ -35,7 +36,7 @@
           {
             home-manager = {
               # Values in "extraSpecialArgs" are propagated to all HM modules.
-              extraSpecialArgs = {inherit inputs system hostname username mylib;};
+              extraSpecialArgs = {inherit inputs system hostname username mylib headless;};
 
               # Use the "pkgs" from the system configuration.
               # This disables "nixpkgs.*" options in HM modules.