diff --git a/nixos/modules/security/oath.nix b/nixos/modules/security/oath.nix
index 93bdc851117a..acf9440b9b92 100644
--- a/nixos/modules/security/oath.nix
+++ b/nixos/modules/security/oath.nix
@@ -1,32 +1,28 @@
 # This module provides configuration for the OATH PAM modules.
-
 { lib, ... }:
-
-with lib;
-
 {
   options = {
 
     security.pam.oath = {
-      enable = mkOption {
-        type = types.bool;
+      enable = lib.mkOption {
+        type = lib.types.bool;
         default = false;
         description = ''
           Enable the OATH (one-time password) PAM module.
         '';
       };
 
-      digits = mkOption {
-        type = types.enum [ 6 7 8 ];
+      digits = lib.mkOption {
+        type = lib.types.enum [ 6 7 8 ];
         default = 6;
         description = ''
-          Specify the length of the one-time password in number of
+          Specify the lib.length of the one-time password in number of
           digits.
         '';
       };
 
-      window = mkOption {
-        type = types.int;
+      window = lib.mkOption {
+        type = lib.types.int;
         default = 5;
         description = ''
           Specify the number of one-time passwords to check in order
@@ -36,8 +32,8 @@ with lib;
         '';
       };
 
-      usersFile = mkOption {
-        type = types.path;
+      usersFile = lib.mkOption {
+        type = lib.types.path;
         default = "/etc/users.oath";
         description = ''
           Set the path to file where the user's credentials are