diff --git a/tools/generate-excludelist.sh b/tools/generate-excludelist.sh
index 9155c3a..aaed9f5 100755
--- a/tools/generate-excludelist.sh
+++ b/tools/generate-excludelist.sh
@@ -37,6 +37,6 @@ EOF
 for item in ${blacklisted[@]:0:${#blacklisted[@]}-1}; do
     echo -e '    "'"$item"'",' >> "$filename"
 done
-echo -e '    "'"${blacklisted[-1]}"'"' >> "$filename"
+echo -e '    "'"${blacklisted[$((${#blacklisted[@]}-1))]}"'"' >> "$filename"
 
 echo "};" >> "$filename"