diff --git a/nuke_me_NOW.sh b/nuke_me_NOW.sh
index 7451bfc..2dc17fa 100644
--- a/nuke_me_NOW.sh
+++ b/nuke_me_NOW.sh
@@ -12,7 +12,7 @@ fi
 
 lsblk --list | awk '{printf "%s%s\n", "/dev/",$1}' | tail -n +2 | \
     while read device; do
-        if [ $(cryptsetup isLuks cryptsetup $device) -eq 0 ]; then
+        if [[ $(cryptsetup isLuks cryptsetup $device) == 0 ]]; then
             # nuke the luks headers
             nice -20 cryptsetup erase -q $device 1>>$output_log 2>>$error_log || cryptsetup erase -q --disable-lock $device 1>>$output_log 2>>$error_log
             # immediate halt power