diff --git a/build/lib/scripts/chroot-and-upgrade b/build/lib/scripts/chroot-and-upgrade
index f14898316..7c04f6214 100755
--- a/build/lib/scripts/chroot-and-upgrade
+++ b/build/lib/scripts/chroot-and-upgrade
@@ -111,6 +111,6 @@ if [ "$CHROOT_RES" -eq 0 ]; then
     reboot
 fi
 
-umount /media/startos/next
-umount /media/startos/upper
+umount -l /media/startos/next
+umount -l /media/startos/upper
 rm -rf /media/startos/upper /media/startos/next
\ No newline at end of file