diff --git a/modules/filter/filter.module b/modules/filter/filter.module
index 7b451b7..619c8be 100644
--- a/modules/filter/filter.module
+++ b/modules/filter/filter.module
@@ -1405,7 +1405,7 @@ function _filter_url($text, $filter) {
   $domain = '(?:[A-Za-z0-9._+-]+\.)?[A-Za-z]{2,64}\b';
   $ip = '(?:[0-9]{1,3}\.){3}[0-9]{1,3}';
   $auth = '[a-zA-Z0-9:%_+*~#?&=.,/;-]+@';
-  $trail = '[a-zA-Z0-9:%_+*~#&\[\]=/;?!\.,-]*[a-zA-Z0-9:%_+*~#&\[\]=/;-]';
+  $trail = '[a-zA-Z0-9:%_+*~#&\(\)\[\]=/;?!\.,-]*[a-zA-Z0-9:%_+*~#&\[\]=/;-]';
 
   // Prepare pattern for optional trailing punctuation.
   // Even these characters could have a valid meaning for the URL, such usage is