diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index aa12099..474f59a 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -72,6 +72,8 @@
     extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
   };
 
+  nix.allowedUsers = [ "@wheel" ];
+
   # List packages installed in system profile. To search, run:
   # $ nix search wget
   environment.systemPackages = with pkgs; [