diff --git a/bbs.php b/bbs.php
index ffb8716..15b4a88 100644
--- a/bbs.php
+++ b/bbs.php
@@ -174,7 +174,7 @@
 			if(!empty($row['comment'])) {
 				$comment = $row['comment'];
 				$comment = preg_replace('/^&gt;(?!&gt;\d).+/m', '<strong>$0</strong>', $comment);
-				$comment = preg_replace('/(https?|mailto|tel|ftp):[^\s]+/m', '<a href="$0">$0</a>', $comment);
+				$comment = preg_replace('/(?:https?|mailto|tel|ftp):[^\s]+/m', '<a href="$0">$0</a>', $comment);
 				$comment = preg_replace_callback('/&gt;&gt;\s*(\d+)/', quote_link, $comment);
 				$comment = str_replace("\n", "<br />", $comment);
 				echo "<p>$comment</p>";