diff --git a/build-liveiso.sh b/build-liveiso.sh
index 8bbed5b..490f742 100644
--- a/build-liveiso.sh
+++ b/build-liveiso.sh
@@ -78,6 +78,14 @@ INITRD="$(ls "$ROOTFS"/boot/initrd.img-* | head -n1)"
 
 cp "$KERNEL" "$ISO/live/vmlinuz"
 cp "$INITRD" "$ISO/live/initrd"
+echo "=== Unmounting file systems ==="
+umount -R "$ROOTFS" 2>/dev/null || true
+
+umount -lf "$ROOTFS/dev/pts" 2>/dev/null || true
+umount -lf "$ROOTFS/dev/shm" 2>/dev/null || true
+umount -lf "$ROOTFS/dev" 2>/dev/null || true
+umount -lf "$ROOTFS/proc" 2>/dev/null || true
+umount -lf "$ROOTFS/sys" 2>/dev/null || true
 
 echo "=== Building SquashFS ==="