diff --git a/syslinux.inc b/syslinux.inc
index 287c006..3a1922f 100644
--- a/syslinux.inc
+++ b/syslinux.inc
@@ -49,6 +49,7 @@ function install_syslinux()
     dd bs=440 count=1 conv=notrunc \
         if=/usr/lib/syslinux/mbr/gptmbr.bin of="$drive"
 
+    dev_from_partnum "$drive" 1
     syslinux "$partition"
 
     mount_efi "$drive"