diff --git a/trolley-arch-chroot.sh b/trolley-arch-chroot.sh
index 26b8264..a1ae4d5 100755
--- a/trolley-arch-chroot.sh
+++ b/trolley-arch-chroot.sh
@@ -1,6 +1,5 @@
 #!/bin/bash
-BLK=$(lsblk | sed -n '2p' | awk '{print $1}')
-DEV="/dev/$BLK"
+DEV=$1
 
 # install grub
 pacman --noconfirm -Sy grub efibootmgr