diff --git a/run.sh b/run.sh
index 585dfba..f55868a 100755
--- a/run.sh
+++ b/run.sh
@@ -62,7 +62,7 @@ case $boot in
     c)
         echo "booting CD with empty disk"
         rm -f ${DISK}
-        dd if=/dev/zero "of=${DISK}" bs=1M count=0 seek=30720
+        dd if=/dev/zero "of=${DISK}" bs=1M count=0 seek=24576
         cfg+=" -drive file=${iso},media=cdrom,if=none,id=cd"
         cfg+=" -device virtio-scsi-pci -device scsi-cd,drive=cd"
         cfg+=" -boot d"