diff --git a/lib/fudo/adguard-dns-proxy.nix b/lib/fudo/adguard-dns-proxy.nix
index b9b6a07..b2e6b40 100644
--- a/lib/fudo/adguard-dns-proxy.nix
+++ b/lib/fudo/adguard-dns-proxy.nix
@@ -143,6 +143,7 @@ in {
           };
         };
       }));
+      default = { };
     };
 
     filters = mkOption {