diff --git a/exports/iso/04-finalise/01-run.sh b/exports/iso/04-finalise/01-run.sh
index a654a3c..bb4c307 100755
--- a/exports/iso/04-finalise/01-run.sh
+++ b/exports/iso/04-finalise/01-run.sh
@@ -93,12 +93,10 @@ GRUBEOF
 
 # Step 5: Create squashfs of the rootfs.
 # live-boot will find this at /live/filesystem.squashfs on the boot medium.
-# Ensure virtual fs mount points exist as empty dirs — live-boot bind-mounts into them.
-# Do NOT exclude them entirely or the directories won't exist in the squashfs.
-for dir in proc sys dev tmp run; do
-	rm -rf "${ROOTFS_DIR:?}/${dir}"
-	mkdir -p "${ROOTFS_DIR}/${dir}"
-done
+# Unmount all virtual filesystems left mounted by on_chroot calls.
+# The empty directories (proc, sys, dev, tmp, run) are left in place so
+# live-boot can bind-mount into them at boot.
+unmount "${ROOTFS_DIR}"
 
 mksquashfs "${ROOTFS_DIR}" "${ISO_TEMP_DIR}/live/filesystem.squashfs" \
 	-comp xz \