diff --git a/flake.nix b/flake.nix
index db98184..da93c48 100644
--- a/flake.nix
+++ b/flake.nix
@@ -103,6 +103,7 @@
         iot-data
         nixfiles-add-secret
         nixfiles-generate-backup-secrets
+        nixfiles-generate-config
         nixfiles-updated-inputs
         nixfiles-update-ssh-host-keys
         pyexcel-xlsx
diff --git a/modules/nixfiles/default.nix b/modules/nixfiles/default.nix
index 07fcfc9..03e1bc5 100644
--- a/modules/nixfiles/default.nix
+++ b/modules/nixfiles/default.nix
@@ -2,16 +2,7 @@
 
 with lib;
 
-let
-  nixfiles-generate-config = pkgs.writeShellApplication {
-    name = "nixfiles-generate-config";
-    text = builtins.readFile ./nixfiles-generate-config.sh;
-    runtimeInputs = [
-      pkgs.git
-    ];
-    checkPhase = "";
-  };
-in {
+{
   options.clerie.nixfiles.enable = mkEnableOption "clerie nixfiles tools";
   config = mkIf config.clerie.nixfiles.enable {
     system.nixos-generate-config.configuration = ''
@@ -37,7 +28,7 @@ in {
       }
     '';
 
-    environment.systemPackages = [
+    environment.systemPackages = with pkgs; [
       nixfiles-generate-config
     ];
   };
diff --git a/pkgs/nixfiles/nixfiles-generate-config.nix b/pkgs/nixfiles/nixfiles-generate-config.nix
new file mode 100644
index 0000000..4c98b3b
--- /dev/null
+++ b/pkgs/nixfiles/nixfiles-generate-config.nix
@@ -0,0 +1,10 @@
+{ pkgs, ... }:
+
+pkgs.writeShellApplication {
+  name = "nixfiles-generate-config";
+  text = builtins.readFile ./nixfiles-generate-config.sh;
+  runtimeInputs = with pkgs; [
+    git
+  ];
+  checkPhase = "";
+}
diff --git a/modules/nixfiles/nixfiles-generate-config.sh b/pkgs/nixfiles/nixfiles-generate-config.sh
old mode 100644
new mode 100755
similarity index 100%
rename from modules/nixfiles/nixfiles-generate-config.sh
rename to pkgs/nixfiles/nixfiles-generate-config.sh
diff --git a/pkgs/overlay.nix b/pkgs/overlay.nix
index af97541..c3327ae 100644
--- a/pkgs/overlay.nix
+++ b/pkgs/overlay.nix
@@ -4,6 +4,7 @@ self: super: {
   iot-data = self.python3.pkgs.callPackage ./iot-data {};
   nixfiles-add-secret = self.callPackage ./nixfiles/nixfiles-add-secret.nix {};
   nixfiles-generate-backup-secrets = self.callPackage ./nixfiles/nixfiles-generate-backup-secrets.nix {};
+  nixfiles-generate-config = self.callPackage ./nixfiles/nixfiles-generate-config.nix {};
   nixfiles-updated-inputs = self.callPackage ./nixfiles/nixfiles-updated-inputs.nix {};
   nixfiles-update-ssh-host-keys = self.callPackage ./nixfiles/nixfiles-update-ssh-host-keys.nix {};
   pyexcel-xlsx = self.python3.pkgs.callPackage ./pyexcel-xlsx {};