diff --git a/modules/darwin/common/upgrade-diff.nix b/modules/darwin/common/upgrade-diff.nix
index 715f0eb..a779993 100644
--- a/modules/darwin/common/upgrade-diff.nix
+++ b/modules/darwin/common/upgrade-diff.nix
@@ -1,12 +1,10 @@
 { config, pkgs, ... }:
 {
-  # set $HOME to avoid 'warning: $HOME is not owned by you'
-  # https://github.com/NixOS/nix/issues/6834
   # srvos
   system.activationScripts.preActivation.text = ''
     if [[ -e /run/current-system ]]; then
       echo "--- diff to current-system"
-      HOME=/var/root ${pkgs.nvd}/bin/nvd --nix-bin-dir=${config.nix.package}/bin diff /run/current-system "$systemConfig"
+      ${pkgs.nvd}/bin/nvd --nix-bin-dir=${config.nix.package}/bin diff /run/current-system "$systemConfig"
       echo "---"
     fi
   '';