diff --git a/nixos/profiles/common/core/default.nix b/nixos/profiles/common/core/default.nix
index cdcdf55..84e8e78 100644
--- a/nixos/profiles/common/core/default.nix
+++ b/nixos/profiles/common/core/default.nix
@@ -10,6 +10,7 @@
       ./hardening
       ./networking
       ./nix
+      ./fun.nix
     ]
     ++ (with inputs; [
       aagl.nixosModules.default
@@ -62,16 +63,6 @@
     settings.PasswordAuthentication = false;
   };
 
-  services.getty.greetingLine = let
-    inherit (config.system) nixos;
-  in ''
-    NixOS ${nixos.label} ${nixos.codeName} (\m) - \l
-    ${lib.strings.optionalString (builtins.elem "nvidia" config.services.xserver.videoDrivers)
-      "--my-next-gpu-wont-be-nvidia"}
-    ${lib.strings.optionalString (builtins.elem "amdgpu" config.boot.initrd.kernelModules)
-      "[    5.996722] amdgpu 0000:67:00.0: Fatal error during GPU init"}
-  '';
-
   users.users = rec {
     "guanranwang" = {
       isNormalUser = true;
diff --git a/nixos/profiles/common/core/fun.nix b/nixos/profiles/common/core/fun.nix
new file mode 100644
index 0000000..4480ce8
--- /dev/null
+++ b/nixos/profiles/common/core/fun.nix
@@ -0,0 +1,24 @@
+{
+  lib,
+  config,
+  ...
+}: {
+  options = {
+    system.nixos.codeName = lib.mkOption {readOnly = false;};
+  };
+
+  config = {
+    # https://github.com/NixOS/nixpkgs/issues/315574
+    system.nixos.codeName = "骆马";
+
+    services.getty.greetingLine = let
+      inherit (config.system) nixos;
+    in ''
+      NixOS ${nixos.label} ${nixos.codeName} (\m) - \l
+      ${lib.strings.optionalString (builtins.elem "nvidia" config.services.xserver.videoDrivers)
+        "--my-next-gpu-wont-be-nvidia"}
+      ${lib.strings.optionalString (builtins.elem "amdgpu" config.boot.initrd.kernelModules)
+        "[    5.996722] amdgpu 0000:67:00.0: Fatal error during GPU init"}
+    '';
+  };
+}