diff --git a/systems/LoutreOS/configuration.nix b/systems/LoutreOS/configuration.nix
index 9b094b3..2343ee6 100644
--- a/systems/LoutreOS/configuration.nix
+++ b/systems/LoutreOS/configuration.nix
@@ -32,6 +32,9 @@ in
     "nixos-config=/etc/nixos/configuration.nix"
   ];
 
+  nixpkgs.config.allowUnfree = false;
+  nixpkgs.config.allowUnfreePredicate = (pkg: builtins.elem (builtins.parseDrvName pkg.name).name [ "factorio-headless" "perl5.28.1-slimserver" ]);
+
   services.zfs = {
     autoSnapshot.enable = true;
     autoScrub.enable = true;
diff --git a/systems/common.nix b/systems/common.nix
index 3b6aba4..6fbe1b1 100644
--- a/systems/common.nix
+++ b/systems/common.nix
@@ -9,7 +9,6 @@
     (import ../overlays/neovim.nix)
   ];
 
-  nixpkgs.config.allowUnfree = true;
   environment.systemPackages = with pkgs; [
     # Editeurs
     neovim