diff --git a/nixos/modules/services/misc/calibre-server.nix b/nixos/modules/services/misc/calibre-server.nix
index 8e2ce2909239..5fa3c11a48aa 100644
--- a/nixos/modules/services/misc/calibre-server.nix
+++ b/nixos/modules/services/misc/calibre-server.nix
@@ -1,7 +1,4 @@
 { config, lib, pkgs, ... }:
-
-with lib;
-
 let
 
   cfg = config.services.calibre-server;
@@ -9,21 +6,21 @@ let
   documentationLink = "https://manual.calibre-ebook.com";
   generatedDocumentationLink = documentationLink + "/generated/en/calibre-server.html";
 
-  execFlags = (concatStringsSep " "
-    (mapAttrsToList (k: v: "${k} ${toString v}") (filterAttrs (name: value: value != null) {
+  execFlags = (lib.concatStringsSep " "
+    (lib.mapAttrsToList (k: v: "${k} ${toString v}") (lib.filterAttrs (name: value: value != null) {
       "--listen-on" = cfg.host;
       "--port" = cfg.port;
       "--auth-mode" = cfg.auth.mode;
       "--userdb" = cfg.auth.userDb;
-    }) ++ [(optionalString (cfg.auth.enable == true) "--enable-auth")])
+    }) ++ [(lib.optionalString (cfg.auth.enable == true) "--enable-auth")])
   );
 in
 
 {
   imports = [
-    (mkChangedOptionModule [ "services" "calibre-server" "libraryDir" ] [ "services" "calibre-server" "libraries" ]
+    (lib.mkChangedOptionModule [ "services" "calibre-server" "libraryDir" ] [ "services" "calibre-server" "libraries" ]
       (config:
-        let libraryDir = getAttrFromPath [ "services" "calibre-server" "libraryDir" ] config;
+        let libraryDir = lib.getAttrFromPath [ "services" "calibre-server" "libraryDir" ] config;
         in [ libraryDir ]
       )
     )
@@ -32,11 +29,11 @@ in
   options = {
     services.calibre-server = {
 
-      enable = mkEnableOption "calibre-server (e-book software)";
+      enable = lib.mkEnableOption "calibre-server (e-book software)";
       package = lib.mkPackageOption pkgs "calibre" { };
 
-      libraries = mkOption {
-        type = types.listOf types.path;
+      libraries = lib.mkOption {
+        type = lib.types.listOf lib.types.path;
         default = [ "/var/lib/calibre-server" ];
         description = ''
           Make sure each library path is initialized before service startup.
@@ -45,20 +42,20 @@ in
         '';
       };
 
-      user = mkOption {
-        type = types.str;
+      user = lib.mkOption {
+        type = lib.types.str;
         default = "calibre-server";
         description = "The user under which calibre-server runs.";
       };
 
-      group = mkOption {
-        type = types.str;
+      group = lib.mkOption {
+        type = lib.types.str;
         default = "calibre-server";
         description = "The group under which calibre-server runs.";
       };
 
-      host = mkOption {
-        type = types.str;
+      host = lib.mkOption {
+        type = lib.types.str;
         default = "0.0.0.0";
         example = "::1";
         description = ''
@@ -67,9 +64,9 @@ in
         '';
       };
 
-      port = mkOption {
+      port = lib.mkOption {
         default = 8080;
-        type = types.port;
+        type = lib.types.port;
         description = ''
           The port on which to listen for connections.
           See the [calibre-server documentation](${generatedDocumentationLink}#cmdoption-calibre-server-port) for details.
@@ -77,8 +74,8 @@ in
       };
 
       auth = {
-        enable = mkOption {
-          type = types.bool;
+        enable = lib.mkOption {
+          type = lib.types.bool;
           default = false;
           description = ''
             Password based authentication to access the server.
@@ -86,8 +83,8 @@ in
           '';
         };
 
-        mode = mkOption {
-          type = types.enum [ "auto" "basic" "digest" ];
+        mode = lib.mkOption {
+          type = lib.types.enum [ "auto" "basic" "digest" ];
           default = "auto";
           description = ''
             Choose the type of authentication used.
@@ -96,9 +93,9 @@ in
           '';
         };
 
-        userDb = mkOption {
+        userDb = lib.mkOption {
           default = null;
-          type = types.nullOr types.path;
+          type = lib.types.nullOr lib.types.path;
           description = ''
             Choose users database file to use for authentication.
             Make sure users database file is initialized before service startup.
@@ -109,7 +106,7 @@ in
     };
   };
 
-  config = mkIf cfg.enable {
+  config = lib.mkIf cfg.enable {
 
     systemd.services.calibre-server = {
       description = "Calibre Server";
@@ -125,7 +122,7 @@ in
 
     environment.systemPackages = [ pkgs.calibre ];
 
-    users.users = optionalAttrs (cfg.user == "calibre-server") {
+    users.users = lib.optionalAttrs (cfg.user == "calibre-server") {
       calibre-server = {
         home = "/var/lib/calibre-server";
         createHome = true;
@@ -134,7 +131,7 @@ in
       };
     };
 
-    users.groups = optionalAttrs (cfg.group == "calibre-server") {
+    users.groups = lib.optionalAttrs (cfg.group == "calibre-server") {
       calibre-server = {
         gid = config.ids.gids.calibre-server;
       };