diff --git a/nix_flake/flake.lock b/nix_flake/flake.lock
index ab71d6f..3ae3fe9 100644
--- a/nix_flake/flake.lock
+++ b/nix_flake/flake.lock
@@ -50,9 +50,22 @@
       "inputs": {
         "naersk": "naersk",
         "nixpkgs": "nixpkgs_2",
+        "src": "src",
         "utils": "utils"
       }
     },
+    "src": {
+      "flake": false,
+      "locked": {
+        "narHash": "sha256-9DWcuVadnJPko8LjBbV7nnYhCBc2VGQKKfo5QYUJFk0=",
+        "path": "..",
+        "type": "path"
+      },
+      "original": {
+        "path": "..",
+        "type": "path"
+      }
+    },
     "utils": {
       "locked": {
         "lastModified": 1648297722,
diff --git a/nix_flake/flake.nix b/nix_flake/flake.nix
index 9f86091..0a687b8 100644
--- a/nix_flake/flake.nix
+++ b/nix_flake/flake.nix
@@ -4,9 +4,11 @@
   inputs = {
     utils.url = "github:numtide/flake-utils";
     naersk.url = "github:nix-community/naersk";
+    src.url = "path:..";
+    src.flake = false;
   };
 
-  outputs = { self, nixpkgs, utils, naersk }:
+  outputs = { self, nixpkgs, utils, naersk, src }:
     utils.lib.eachDefaultSystem (system: let
       pkgs = nixpkgs.legacyPackages."${system}";
       naersk-lib = naersk.lib."${system}";
@@ -14,7 +16,7 @@
       # `nix build`
       packages.quickpeep = naersk-lib.buildPackage {
         pname = "quickpeep";
-        root = ./..;
+        root = src;
         buildInputs = with pkgs; [
           openssl
           pkgconfig
@@ -39,7 +41,7 @@
 
       # NixOS Modules
       nixosModules = {
-        quickpeepSearch = import ./modules/quickpeepSearch.nix;
+        quickpeepSearch = import ./modules/quickpeepSearch.nix self;
       };
 
       # `nix run`
diff --git a/nix_flake/modules/quickpeepSearch.nix b/nix_flake/modules/quickpeepSearch.nix
index 356cbe4..0e83383 100644
--- a/nix_flake/modules/quickpeepSearch.nix
+++ b/nix_flake/modules/quickpeepSearch.nix
@@ -1,7 +1,8 @@
-{config, pkgs, lib, quickpeep, ...}:
+flake: {config, pkgs, lib, ...}:
 
 let
   cfg = config.services.quickpeepSearch;
+  inherit (flake.packages.${pkgs.stdenv.hostPlatform.system}) quickpeep;
 in
 
 with lib;
@@ -19,7 +20,7 @@ with lib;
 
       user = mkOption {
         default = "quickpeep";
-        type = with types; uniq string;
+        type = with types; uniq str;
         description = ''
           Name of the user.
         '';
@@ -27,7 +28,7 @@ with lib;
 
       bindHost = mkOption {
         default = "127.0.0.1";
-        type = with types; string;
+        type = with types; str;
         description = ''
           Host upon which to bind the web interface.
         '';
@@ -44,6 +45,13 @@ with lib;
   };
 
   config = mkIf cfg.enable {
+    users.users."${cfg.user}" = {
+      description = "Hallo daemon user";
+      isSystemUser = true;
+      group = "${cfg.user}";
+    };
+    users.groups."${cfg.user}" = {};
+
     systemd.services.quickpeepSearch = {
       wantedBy = [ "multi-user.target" ];
       after = [ "network.target" ];
@@ -51,11 +59,8 @@ with lib;
       serviceConfig = {
         Type = "simple";
         User = "${cfg.user}";
-        ExecStart = ''${quickpeep.quickpeep}/bin/quickpeep ${cfg.bindHost}:${cfg.bindPort}'';
+        ExecStart = ''${quickpeep}/bin/quickpeep ${cfg.bindHost}:${builtins.toString cfg.bindPort}'';
       };
     };
-
-    # TODO Do we need to specify quickpeep here?
-    environment.systemPackages = [ quickpeep.quickpeep ];
   };
 }
diff --git a/nix_flake/test_vm/flake.lock b/nix_flake/test_vm/flake.lock
index 631677b..c9e473c 100644
--- a/nix_flake/test_vm/flake.lock
+++ b/nix_flake/test_vm/flake.lock
@@ -102,11 +102,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1648383610,
-        "narHash": "sha256-egKvd+S5FEpjwK2aCoJ+NrBG2m+9Njl4I1OXrDTZHvE=",
+        "lastModified": 1649117019,
+        "narHash": "sha256-ID7nw/8MDgqj/cbJ0wy6AtQ9wp58hSnE6+weZwuHnso=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "7a3f9d626c8a88141077ab99d8352469aa6feeb7",
+        "rev": "ccb90fb9e11459aeaf83cc28d5f8910816d90dd0",
         "type": "github"
       },
       "original": {
@@ -148,10 +148,11 @@
       "inputs": {
         "naersk": "naersk",
         "nixpkgs": "nixpkgs_4",
+        "src": "src",
         "utils": "utils"
       },
       "locked": {
-        "narHash": "sha256-sIsKWG16MmzhkFFyHBgRPeSnREpDY1ylPjCBKhogsjs=",
+        "narHash": "sha256-ottHXBWVE2yM6xPwbKQuBL39BZTa1hlMYR30QA7TmzY=",
         "path": "..",
         "type": "path"
       },
@@ -168,6 +169,18 @@
         "quickpeep": "quickpeep"
       }
     },
+    "src": {
+      "flake": false,
+      "locked": {
+        "narHash": "sha256-9DWcuVadnJPko8LjBbV7nnYhCBc2VGQKKfo5QYUJFk0=",
+        "path": "..",
+        "type": "path"
+      },
+      "original": {
+        "path": "..",
+        "type": "path"
+      }
+    },
     "utils": {
       "locked": {
         "lastModified": 1648297722,