diff --git a/alarm/uboot-wandboard/uboot-wandboard.install b/alarm/uboot-wandboard/uboot-wandboard.install
index a2e97dda5..c74dc9766 100644
--- a/alarm/uboot-wandboard/uboot-wandboard.install
+++ b/alarm/uboot-wandboard/uboot-wandboard.install
@@ -4,6 +4,7 @@ flash_uboot() {
   read -r shouldwe
   if [[ $shouldwe =~ ^([yY][eE][sS]|[yY])$ ]]; then
     dd if=/boot/u-boot.imx of=/dev/mmcblk0 bs=512 seek=2
+    sync
   else
     echo "You can do this later by running:"
     echo "# dd if=/boot/u-boot.imx of=/dev/mmcblk0 bs=512 seek=2"