diff --git a/image_to_usb.sh b/image_to_usb.sh
index 361750cb93..526319370a 100755
--- a/image_to_usb.sh
+++ b/image_to_usb.sh
@@ -214,6 +214,7 @@ then
 
   echo "Copying ${SRC_IMAGE} to ${FLAGS_to}..."
   sudo dd if="${SRC_IMAGE}" of="${FLAGS_to}" bs=4M
+  sync
 
   echo "Done."
 else