diff --git a/nixos/modules/misc/crashdump.nix b/nixos/modules/misc/crashdump.nix
index b0f75d9caaa3..d67a4aa412ce 100644
--- a/nixos/modules/misc/crashdump.nix
+++ b/nixos/modules/misc/crashdump.nix
@@ -1,11 +1,8 @@
 { config, lib, pkgs, ... }:
-
-with lib;
-
 let
   crashdump = config.boot.crashDump;
 
-  kernelParams = concatStringsSep " " crashdump.kernelParams;
+  kernelParams = lib.concatStringsSep " " crashdump.kernelParams;
 
 in
 ###### interface
@@ -13,8 +10,8 @@ in
   options = {
     boot = {
       crashDump = {
-        enable = mkOption {
-          type = types.bool;
+        enable = lib.mkOption {
+          type = lib.types.bool;
           default = false;
           description = ''
             If enabled, NixOS will set up a kernel that will
@@ -24,17 +21,17 @@ in
             It also activates the NMI watchdog.
           '';
         };
-        reservedMemory = mkOption {
+        reservedMemory = lib.mkOption {
           default = "128M";
-          type = types.str;
+          type = lib.types.str;
           description = ''
             The amount of memory reserved for the crashdump kernel.
             If you choose a too high value, dmesg will mention
             "crashkernel reservation failed".
           '';
         };
-        kernelParams = mkOption {
-          type = types.listOf types.str;
+        kernelParams = lib.mkOption {
+          type = lib.types.listOf lib.types.str;
           default = [ "1" "boot.shell_on_fail" ];
           description = ''
             Parameters that will be passed to the kernel kexec-ed on crash.
@@ -46,7 +43,7 @@ in
 
 ###### implementation
 
-  config = mkIf crashdump.enable {
+  config = lib.mkIf crashdump.enable {
     boot = {
       postBootCommands = ''
         echo "loading crashdump kernel...";