diff --git a/mkimage.sh b/mkimage.sh
index feff27b..b79d63a 100755
--- a/mkimage.sh
+++ b/mkimage.sh
@@ -185,7 +185,7 @@ umount "$MY_TMPDIR"/boot
 
 # ------------------------------------------------------------------------------
 # root1
-dd bs=4096 if="$SOURCE"/root.img of=${DEV_PART}2 status=progress
+dd bs=4096 conv=fsync if="$SOURCE"/root.img of=${DEV_PART}2 status=progress
 
 # ------------------------------------------------------------------------------
 # data