diff --git a/nixos/modules/services/networking/yggdrasil.nix b/nixos/modules/services/networking/yggdrasil.nix
index 3f2f0277f59a..5d2dc2b8cd41 100644
--- a/nixos/modules/services/networking/yggdrasil.nix
+++ b/nixos/modules/services/networking/yggdrasil.nix
@@ -13,7 +13,6 @@ let
     bool
     listOf
     str
-    attrs
     submodule
     ;
   cfg = config.services.yggdrasil;
@@ -69,7 +68,7 @@ in
 
       settings = mkOption {
         type = submodule {
-          freeformType = attrs;
+          freeformType = (pkgs.formats.json { }).type;
           options = {
             PrivateKeyPath = mkOption {
               type = nullOr path;