diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index 2813df4..568e594 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -100,9 +100,9 @@
 
   # List packages installed in system profile. To search, run:
   # $ nix search wget
-  nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
-    "dwarf-fortress"
-  ];
+  allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
+             "dwarf-fortress"
+];
   environment.systemPackages = with pkgs; [
     neovim 
     wget