diff --git a/nix/modules/customer-portal/flake-module.nix b/nix/modules/customer-portal/flake-module.nix
index fbe1dc7..e5a1cf5 100755
--- a/nix/modules/customer-portal/flake-module.nix
+++ b/nix/modules/customer-portal/flake-module.nix
@@ -3,7 +3,8 @@
   flake.nixosModules.default =
     nixos@{ config, pkgs, lib, utils, ... }:
     let
-      inherit (lib) mkEnableOption mkPackageOption mkOption mkIf toString types;
+      inherit (builtins) toString;
+      inherit (lib) mkEnableOption mkPackageOption mkOption mkIf types;
 
       format = pkgs.formats.json {};