diff --git a/flake.nix b/flake.nix
index 1ff635b..805f831 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,21 +7,20 @@
   inputs.gomod2nix.inputs.nixpkgs.follows = "nixpkgs";
   inputs.gomod2nix.inputs.flake-utils.follows = "flake-utils";
 
-  outputs = inputs @ { self, nixpkgs, flake-utils, gomod2nix }:
-    (flake-utils.lib.eachDefaultSystem
-      (system:
-        let
-          pkgs = nixpkgs.legacyPackages.${system};
-          callPackage = pkgs.darwin.apple_sdk_11_0.callPackage or pkgs.callPackage;
-        in
-        {
-          packages.default = callPackage ./. {
-            inherit (gomod2nix.legacyPackages.${system}) buildGoApplication;
-          };
-          devShells.default = callPackage ./shell.nix {
-            inherit (gomod2nix.legacyPackages.${system}) mkGoEnv gomod2nix;
-          };
-          nixosModules.default = import ./module.nix inputs;
-        })
-    );
+  outputs = inputs@{ self, nixpkgs, flake-utils, gomod2nix }:
+    (flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        callPackage =
+          pkgs.darwin.apple_sdk_11_0.callPackage or pkgs.callPackage;
+      in {
+        packages.default = callPackage ./. {
+          inherit (gomod2nix.legacyPackages.${system}) buildGoApplication;
+        };
+        devShells.default = callPackage ./shell.nix {
+          inherit (gomod2nix.legacyPackages.${system}) mkGoEnv gomod2nix;
+        };
+      })) // {
+        nixosModules.default = import ./module.nix inputs;
+      };
 }
diff --git a/module.nix b/module.nix
index 5cbd33c..84bcf7d 100644
--- a/module.nix
+++ b/module.nix
@@ -4,61 +4,62 @@ let
   inherit (pkgs.stdenv.hostPlatform) system;
   cfg = config.services.birdtown-visit-counter;
   inherit (lib) types mkOption mkIf;
-  package = inputs.self.packages."${system}".birdtown-visit-counter;
+  package = inputs.self.packages."${system}".default;
 in {
   options.services.birdtown-visit-counter = {
-      enable = mkOption {
-        type = types.bool;
-        default = false;
-      };
-      listenPort = mkOption {
-        type = types.int;
-        default = 11567;
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+    };
+    listenPort = mkOption {
+      type = types.int;
+      default = 11568;
+    };
+  };
+  config = mkIf cfg.enable {
+    users.users.birdtown-visit-counter = {
+      group = "birdtown-visit-counter";
+      home = "/var/lib/birdtown-visit-counter";
+      isSystemUser = true;
+      createHome = true;
+    };
+    users.groups.birdtown-visit-counter = { };
+
+    systemd.services.birdtown-visit-counter = {
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        ExecStart =
+          "${package}/bin/birdtown-visit-counter -addr :${toString  cfg.listenPort} -file visits.json";
+        User = "birdtown-visit-counter";
+        Group = "birdtown-visit-counter";
+        WorkingDirectory = "/var/lib/birdtown-visit-counter";
       };
     };
-  config = {
-    users.users.birdtown-visit-counter = {
-        group = "birdtown-visit-counter";
-        home = "/var/lib/birdtown-visit-counter";
-        isSystemUser = true;
-        createHome = true;
-      };
-      users.groups.birdtown-visit-counter = { };
 
-      systemd.services.birdtown-visit-counter = {
-        after = [ "network.target" ];
-        wantedBy = [ "multi-user.target" ];
-        serviceConfig = {
-          ExecStart = "${package}/bin/birdtown-visit-counter -addr :${cfg.listenPort} -file visits.json";
-          User = "birdtown-visit-counter";
-          Group = "birdtown-visit-counter";
-          WorkingDirectory = "/var/lib/birdtown-visit-counter";
-        };
+    systemd.timers.birdtown-visits-saver = {
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        OnBootSec = "10m";
+        OnUnitActiveSec = "10m";
+        Unit = "birdtown-visits-saver.service";
       };
+    };
 
-      systemd.timers.birdtown-visits-saver = {
-        wantedBy = [ "timers.target" ];
-        timerConfig = {
-          OnBootSec = "10m";
-          OnUnitActiveSec = "10m";
-          Unit = "birdtown-visits-saver.service";
-        };
-      };
-
-      systemd.services.birdtown-visits-saver = {
-        script = ''
-          set -eu
-          if ${pkgs.curl}/bin/curl http://localhost:${cfg.listenPort}/visits > visits-new.json; then
-             cp visits-new.json "$(date +"%Y-%m-%d-%H-%M").json"
-             mv visits-new.json visits.json
-           fi
-        '';
-        serviceConfig = {
-          Type = "oneshot";
-          User = "birdtown-visit-counter";
-          Group = "birdtown-visit-counter";
-          WorkingDirectory = "/var/lib/birdtown-visit-counter";
-        };
+    systemd.services.birdtown-visits-saver = {
+      script = ''
+        set -eu
+        if ${pkgs.curl}/bin/curl http://localhost:${toString cfg.listenPort}/visits > visits-new.json; then
+           cp visits-new.json "$(date +"%Y-%m-%d-%H-%M").json"
+           mv visits-new.json visits.json
+         fi
+      '';
+      serviceConfig = {
+        Type = "oneshot";
+        User = "birdtown-visit-counter";
+        Group = "birdtown-visit-counter";
+        WorkingDirectory = "/var/lib/birdtown-visit-counter";
       };
+    };
   };
 }