diff --git a/nixos/modules/virtualisation/guest-networking-options.nix b/nixos/modules/virtualisation/guest-networking-options.nix
index 817ccc4e6370..39d9eea24f3d 100644
--- a/nixos/modules/virtualisation/guest-networking-options.nix
+++ b/nixos/modules/virtualisation/guest-networking-options.nix
@@ -71,7 +71,7 @@ in
     virtualisation.vlans = lib.mkOption {
       type = types.listOf types.ints.unsigned;
       default = if cfg.interfaces == { } then [ 1 ] else [ ];
-      defaultText = lib.literalExpression "if cfg.interfaces == {} then [ 1 ] else [ ]";
+      defaultText = lib.literalExpression "if config.virtualisation.interfaces == {} then [ 1 ] else [ ]";
       example = [
         1
         2