diff --git a/nix/lib/config/options.nix b/nix/lib/config/options.nix
index 752c3f9..c682eb6 100644
--- a/nix/lib/config/options.nix
+++ b/nix/lib/config/options.nix
@@ -93,6 +93,7 @@ let
       domainName = mkOption {
         description = "Domain name option";
         type = types.str;
+        default = "${name}.zentralwerk.org";
       };
     };
   };