diff --git a/src/reversing/bh_zerostring.sh b/src/reversing/bh_zerostring.sh
index 9bfe68b..3b8d945 100644
--- a/src/reversing/bh_zerostring.sh
+++ b/src/reversing/bh_zerostring.sh
@@ -4,13 +4,12 @@ bh_zerostring() {
 	local fil="$1"
 	local search="$2"
 
-	# 'tr' is needed here because strings command outputs lines
-	# starting with two space characters in some systems
-	local pos=$(strings -t d "$fil" | grep -F "$search" | tr -s ' ' ' ' | cut -d' ' -f2)
+	# 'tr' is needed here because the strings command
+    # might output lines starting with two spaces
+	local pos=$(strings -t d "$fil" | grep -F "$search" | tr -s ' ' ' ' | cut -d' ' -f1)
 
-	siz=${#search}
+	local siz=${#search}
 	for i in $pos; do
-		[[ $i -gt 0 ]] || continue
 		dd conv=notrunc bs=1 count=$siz seek=$i if=/dev/zero of="$fil"
 	done
 }