diff --git a/setup.sh b/setup.sh
index 24bbc73..e1b773a 100644
--- a/setup.sh
+++ b/setup.sh
@@ -212,7 +212,7 @@ function mount_system () {
     zfs mount "${zpool_name}"'/root/'"${zfs_arch_dataset_name}"
     zfs mount -a
 
-    local efi_part="$(select_part 'efi' "${zpool_drive:?})"
+    local efi_part="$(select_part 'efi' "${zpool_drive:?}")"
     mkdir -p '/mnt/efi'
     mount "${efi_part}" '/mnt/efi'
 }