diff --git a/personal-gui/nixos.nix b/personal-gui/nixos.nix
index 2255434..60df417 100644
--- a/personal-gui/nixos.nix
+++ b/personal-gui/nixos.nix
@@ -23,7 +23,7 @@
   security.pam.yubico = {
     enable = true;
     debug = false;
-    module = "challenge-response";
+    mode = "challenge-response";
   };
   services.udev.packages = with pkgs; [ yubikey-personalization ];