diff --git a/hosts/greatyamada/nixos/default.nix b/hosts/greatyamada/nixos/default.nix
index c5c62c2..ff6aadf 100644
--- a/hosts/greatyamada/nixos/default.nix
+++ b/hosts/greatyamada/nixos/default.nix
@@ -1,8 +1,10 @@
-{ lib, ... }: {
+{ lib, pkgs, ... }: {
   imports = [ ./filesystems.nix ];
 
   boot.loader.systemd-boot.enable = true;
 
+  environment.systemPackages = with pkgs; [ iptables ];
+
   networking = {
     firewall.enable = true;
     hostName = "greatyamada";