diff --git a/nixos/systems/altra/default.nix b/nixos/systems/altra/default.nix
index d78ea94..f49c54b 100644
--- a/nixos/systems/altra/default.nix
+++ b/nixos/systems/altra/default.nix
@@ -44,7 +44,7 @@ in
           ];
 
           environment.defaultPackages = mkForce [];
-          nix.allowedUsers = [ "@wheel" ];
+          nix.settings.allowed-users = [ "@wheel" ];
           security.sudo.execWheelOnly = true;
 
           security.auditd.enable = true;