diff --git a/syslinux.inc b/syslinux.inc
index 389bcbb..2bc0719 100644
--- a/syslinux.inc
+++ b/syslinux.inc
@@ -46,12 +46,15 @@ function install_syslinux()
 
     apt -yq install syslinux syslinux-common syslinux-efi
 
-    dd bs=440 count=1 conv=notrunc \
-        if=/usr/lib/syslinux/mbr/gptmbr.bin of="$drive"
-
     sleep 5
     dev_from_partnum "$drive" 1
     syslinux "$partition"
+    sync
+    sleep 5
+    dd bs=440 count=1 conv=notrunc \
+        if=/usr/lib/syslinux/mbr/gptmbr.bin of="$drive"
+    sync
+    sleep 5
 
     mount_efi "$drive"