diff --git a/mkusb.sh b/mkusb.sh
index c7b63ea..338000b 100644
--- a/mkusb.sh
+++ b/mkusb.sh
@@ -46,7 +46,7 @@ if [[ " ${DISKS[@]} " =~ " $DEVICE " ]]; then
   mkdir -p /mnt/apusb
   mount ${DEVICE}1 /mnt/apusb
   echo "copy files ..."
-  cp boot_tiny/* /mnt/apusb/
+  cp -r boot_tiny/* /mnt/apusb/
   umount /mnt/apusb
 
   rm -rf boot_tiny