diff --git a/system/programs/hyprland.nix b/system/programs/hyprland.nix
index ba4df01..1306a81 100644
--- a/system/programs/hyprland.nix
+++ b/system/programs/hyprland.nix
@@ -1,5 +1,7 @@
 {
   inputs,
+  config,
+  lib,
   pkgs,
   ...
 }: {
@@ -8,4 +10,19 @@
     package = inputs.hyprland.packages.${pkgs.system}.hyprland;
     portalPackage = inputs.hyprland.packages.${pkgs.system}.xdg-desktop-portal-hyprland;
   };
+
+  # copied from https://github.com/linyinfeng/dotfiles/blob/91b0363b093303f57885cbae9da7f8a99bbb4432/nixos/profiles/graphical/niri/default.nix#L17-L29
+  security.pam.services.hyprlock.text = lib.mkIf config.services.fprintd.enable ''
+    account required pam_unix.so
+
+    # check passwork before fprintd
+    auth sufficient pam_unix.so try_first_pass likeauth
+    auth sufficient ${pkgs.fprintd}/lib/security/pam_fprintd.so
+    auth required pam_deny.so
+
+    password sufficient pam_unix.so nullok yescrypt
+
+    session required pam_env.so conffile=/etc/pam/environment readenv=0
+    session required pam_unix.so
+  '';
 }