diff --git a/modules/extern/nixos/dns.nix b/modules/extern/nixos/dns.nix
index b90581ef..1df0b417 100644
--- a/modules/extern/nixos/dns.nix
+++ b/modules/extern/nixos/dns.nix
@@ -68,6 +68,7 @@
       nameservers = let
         inherit (gensokyo-zone.systems) utsuho hakurei;
       in mkMerge [
+        (mkOptionDefault [ ])
         (mkIf access.local.enable [
           (mkIf enableIPv6 utsuho.config.access.address6ForNetwork.local)
           utsuho.config.access.address4ForNetwork.local