diff --git a/configuration.nix b/configuration.nix
index 0a1ad1e..85afcff 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -22,6 +22,7 @@ in
     ./extra/dvd.nix
     ./extra/bluray.nix
     ./extra/platformio.nix
+    ./extra/yubikey.nix
   ];
 
   hardware.bluetooth.enable = true;
@@ -236,8 +237,6 @@ in
   # Enable the OpenSSH daemon.
   # services.openssh.enable = true;
 
-  services.udev.packages = [ pkgs.platformio ];
-
   # Open ports in the firewall.
   # networking.firewall.allowedTCPPorts = [ ... ];
   # networking.firewall.allowedUDPPorts = [ ... ];
diff --git a/extra/platformio.nix b/extra/platformio.nix
index 10d773d..8e85c86 100644
--- a/extra/platformio.nix
+++ b/extra/platformio.nix
@@ -1,4 +1,7 @@
 { pkgs, config, ... }: {
+
+    services.udev.packages = [ pkgs.platformio ];
+
     # embedded board development
     environment.systemPackages = with pkgs; [
         platformio-core # toolchain manager for various microcontrollers