diff --git a/lib/fudo/domains.nix b/lib/fudo/domains.nix
index 4aaa28c..9f97027 100644
--- a/lib/fudo/domains.nix
+++ b/lib/fudo/domains.nix
@@ -62,6 +62,7 @@ let
               };
             };
           });
+          default = null;
         };
 
         log-aggregator = mkOption {