diff --git a/.dev-tools/setup-ngxblocker/setup-ngxblocker b/.dev-tools/setup-ngxblocker/setup-ngxblocker
index ae32db053..76b40205a 100644
--- a/.dev-tools/setup-ngxblocker/setup-ngxblocker
+++ b/.dev-tools/setup-ngxblocker/setup-ngxblocker
@@ -221,9 +221,8 @@ find_line() {
 		# ignore file #comments
 		#first) awk "/$find_str/{ print NR; exit }" $file;;
 		#last) awk "/$find_str/{ print NR }" $file | tail -n1;;
-
-first) grep -nE "^$[[:space:]]+find_str" $file | head -n1 | awk -F: '{print $1}';;
-last) grep -nE "^[[:space:]]+$find_str" $file | tail -n1 | awk -F: '{print $1}';;
+		first) grep -nE "^[[:space:]]+find_str" $file | head -n1 | awk -F: '{print $1}';;
+		last) grep -nE "[[:space:]]+$find_str" $file | tail -n1 | awk -F: '{print $1}';;
 	esac
 }