diff --git a/modules/installer/virtualbox-demo.nix b/modules/installer/virtualbox-demo.nix
index c965be2ad853..76cc29a1facd 100644
--- a/modules/installer/virtualbox-demo.nix
+++ b/modules/installer/virtualbox-demo.nix
@@ -1,5 +1,7 @@
 { config, pkgs, ... }:
 
+with pkgs.lib;
+
 {
   imports =
     [ ../virtualisation/virtualbox-image.nix