diff --git a/bash/hetzner-rescue.sh b/bash/hetzner-rescue.sh
index a5588be..5833bf0 100644
--- a/bash/hetzner-rescue.sh
+++ b/bash/hetzner-rescue.sh
@@ -162,9 +162,9 @@ function hetzner-rescue-wipe-12-10-10 {
         parted "${device}" unit "${unit}" \
         mkpart "bios-${number}" 1 2
         parted "${device}" set 4 bios_grub on
+        # wipe bios
+        dd if='/dev/zero' of="${device}4"
     done
-    # wipe bios
-    dd if='/dev/zero' of='/dev/sda4'
     # format esp
     mkfs.vfat -F 32 -n 'esp' '/dev/sda3'
     # format boot