diff --git a/nixos/modules/services/games/terraria.nix b/nixos/modules/services/games/terraria.nix
index 4c32cc92a1b9..144186dc7701 100644
--- a/nixos/modules/services/games/terraria.nix
+++ b/nixos/modules/services/games/terraria.nix
@@ -1,13 +1,10 @@
 { config, lib, options, pkgs, ... }:
-
-with lib;
-
 let
   cfg   = config.services.terraria;
   opt   = options.services.terraria;
   worldSizeMap = { small = 1; medium = 2; large = 3; };
-  valFlag = name: val: optionalString (val != null) "-${name} \"${escape ["\\" "\""] (toString val)}\"";
-  boolFlag = name: val: optionalString val "-${name}";
+  valFlag = name: val: lib.optionalString (val != null) "-${name} \"${lib.escape ["\\" "\""] (toString val)}\"";
+  boolFlag = name: val: lib.optionalString val "-${name}";
   flags = [
     (valFlag "port" cfg.port)
     (valFlag "maxPlayers" cfg.maxPlayers)
@@ -46,8 +43,8 @@ in
 {
   options = {
     services.terraria = {
-      enable = mkOption {
-        type        = types.bool;
+      enable = lib.mkOption {
+        type        = lib.types.bool;
         default     = false;
         description = ''
           If enabled, starts a Terraria server. The server can be connected to via `tmux -S ''${config.${opt.dataDir}}/terraria.sock attach`
@@ -55,40 +52,40 @@ in
         '';
       };
 
-      port = mkOption {
-        type        = types.port;
+      port = lib.mkOption {
+        type        = lib.types.port;
         default     = 7777;
         description = ''
           Specifies the port to listen on.
         '';
       };
 
-      maxPlayers = mkOption {
-        type        = types.ints.u8;
+      maxPlayers = lib.mkOption {
+        type        = lib.types.ints.u8;
         default     = 255;
         description = ''
           Sets the max number of players (between 1 and 255).
         '';
       };
 
-      password = mkOption {
-        type        = types.nullOr types.str;
+      password = lib.mkOption {
+        type        = lib.types.nullOr lib.types.str;
         default     = null;
         description = ''
           Sets the server password. Leave `null` for no password.
         '';
       };
 
-      messageOfTheDay = mkOption {
-        type        = types.nullOr types.str;
+      messageOfTheDay = lib.mkOption {
+        type        = lib.types.nullOr lib.types.str;
         default     = null;
         description = ''
           Set the server message of the day text.
         '';
       };
 
-      worldPath = mkOption {
-        type        = types.nullOr types.path;
+      worldPath = lib.mkOption {
+        type        = lib.types.nullOr lib.types.path;
         default     = null;
         description = ''
           The path to the world file (`.wld`) which should be loaded.
@@ -97,8 +94,8 @@ in
         '';
       };
 
-      autoCreatedWorldSize = mkOption {
-        type        = types.enum [ "small" "medium" "large" ];
+      autoCreatedWorldSize = lib.mkOption {
+        type        = lib.types.enum [ "small" "medium" "large" ];
         default     = "medium";
         description = ''
           Specifies the size of the auto-created world if `worldPath` does not
@@ -106,34 +103,34 @@ in
         '';
       };
 
-      banListPath = mkOption {
-        type        = types.nullOr types.path;
+      banListPath = lib.mkOption {
+        type        = lib.types.nullOr lib.types.path;
         default     = null;
         description = ''
           The path to the ban list.
         '';
       };
 
-      secure = mkOption {
-        type        = types.bool;
+      secure = lib.mkOption {
+        type        = lib.types.bool;
         default     = false;
         description = "Adds additional cheat protection to the server.";
       };
 
-      noUPnP = mkOption {
-        type        = types.bool;
+      noUPnP = lib.mkOption {
+        type        = lib.types.bool;
         default     = false;
         description = "Disables automatic Universal Plug and Play.";
       };
 
-      openFirewall = mkOption {
-        type = types.bool;
+      openFirewall = lib.mkOption {
+        type = lib.types.bool;
         default = false;
         description = "Whether to open ports in the firewall";
       };
 
-      dataDir = mkOption {
-        type        = types.str;
+      dataDir = lib.mkOption {
+        type        = lib.types.str;
         default     = "/var/lib/terraria";
         example     = "/srv/terraria";
         description = "Path to variable state data directory for terraria.";
@@ -141,7 +138,7 @@ in
     };
   };
 
-  config = mkIf cfg.enable {
+  config = lib.mkIf cfg.enable {
     users.users.terraria = {
       description = "Terraria server service user";
       group       = "terraria";
@@ -165,12 +162,12 @@ in
         Type = "forking";
         GuessMainPID = true;
         UMask = 007;
-        ExecStart = "${tmuxCmd} new -d ${pkgs.terraria-server}/bin/TerrariaServer ${concatStringsSep " " flags}";
+        ExecStart = "${tmuxCmd} new -d ${pkgs.terraria-server}/bin/TerrariaServer ${lib.concatStringsSep " " flags}";
         ExecStop = "${stopScript} $MAINPID";
       };
     };
 
-    networking.firewall = mkIf cfg.openFirewall {
+    networking.firewall = lib.mkIf cfg.openFirewall {
       allowedTCPPorts = [ cfg.port ];
       allowedUDPPorts = [ cfg.port ];
     };