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 d933e4b..669b13a 100644
--- a/module.nix
+++ b/module.nix
@@ -4,7 +4,7 @@ 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 {
@@ -30,7 +30,7 @@ in {
       wantedBy = [ "multi-user.target" ];
       serviceConfig = {
         ExecStart =
-          "${package}/bin/birdtown-visit-counter -addr :${cfg.listenPort} -file visits.json";
+          "${package}/bin/birdtown-visit-counter -addr :${tostring  cfg.listenPort} -file visits.json";
         User = "birdtown-visit-counter";
         Group = "birdtown-visit-counter";
         WorkingDirectory = "/var/lib/birdtown-visit-counter";