diff --git a/pacman-zbm-syslinux-regen.sh b/pacman-zbm-syslinux-regen.sh
index d74ac9a..3a66e3c 100644
--- a/pacman-zbm-syslinux-regen.sh
+++ b/pacman-zbm-syslinux-regen.sh
@@ -8,7 +8,7 @@ boot_disk="$(findmnt --noheadings --target "${boot_dir}" --output 'SOURCE')" ||
         'Cowardly exiting. No syslinux files nor MBR were overwritten.'
     exit 1
 }
-if [[ "$(<<<"${boot_dir}" wc -l)" -gt '1' ]]; then
+if [[ "$(<<<"${boot_fs}" wc -l)" -gt '1' ]]; then
     printf -- '%s\n' \
         'More than one drive mounted at '"'${boot_dir}'"' boot dir.' \
         'Cowardly exiting. No syslinux files nor MBR were overwritten.'