diff --git a/pkgs/clan-cli/clan_cli/inventory/update.sh b/pkgs/clan-cli/clan_cli/inventory/update.sh
index bc0d6a7bc..b62b8430e 100755
--- a/pkgs/clan-cli/clan_cli/inventory/update.sh
+++ b/pkgs/clan-cli/clan_cli/inventory/update.sh
@@ -1,4 +1,8 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
+
 jsonSchema=$(nix build .#schemas.inventory-schema-abstract --print-out-paths)/schema.json
-nix run .#classgen  "$jsonSchema" "$PKG_ROOT/clan_cli/inventory/classes.py" -- --stop-at "Service"
\ No newline at end of file
+SCRIPT_DIR=$(dirname "$0")
+cd "$SCRIPT_DIR"
+nix run .#classgen -- "$jsonSchema" "../../../clan-cli/clan_cli/inventory/classes.py" --stop-at "Service"