diff --git a/kickstart/veilor-os.ks b/kickstart/veilor-os.ks
index 5700eed..028ed0c 100644
--- a/kickstart/veilor-os.ks
+++ b/kickstart/veilor-os.ks
@@ -133,7 +133,9 @@ fira-code-fonts
 # ── Post-install (nochroot): copy overlay tree into installed root ──
 %post --nochroot
 set -eu
-DEST=/mnt/sysimage
+# DEST: livecd-creator sets INSTALL_ROOT, livemedia-creator uses /mnt/sysimage.
+DEST="${INSTALL_ROOT:-/mnt/sysimage}"
+[[ -d $DEST ]] || { echo "[ERR] DEST=$DEST does not exist (livecd-creator? livemedia-creator?)" >&2; exit 1; }
 
 # Try multiple source paths:
 #   /run/install/repo/veilor — boot ISO (--virt mode)