diff --git a/image-builder/image_builder.sh b/image-builder/image_builder.sh
index 42fd082361..0177830b50 100755
--- a/image-builder/image_builder.sh
+++ b/image-builder/image_builder.sh
@@ -267,6 +267,7 @@ create_rootfs_disk
 info "rootfs size ${ROOTFS_SIZE} MB"
 info "Copying content from rootfs to root partition"
 cp -a "${ROOTFS}"/* ${MOUNT_DIR}
+sync
 OK "rootfs copied"
 
 unmount