Index: modules/user/user.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.module,v
retrieving revision 1.830
diff -u -p -r1.830 user.module
--- modules/user/user.module	12 Aug 2007 19:25:57 -0000	1.830
+++ modules/user/user.module	15 Aug 2007 00:20:12 -0000
@@ -3182,7 +3182,7 @@ function user_forms() {
 /**
  * Implementation of hook_comments().
  */
-function user_comment($comment, $op) {
+function user_comment(&$comment, $op) {
   // Validate signature.
   if ($op == 'view') {
     if (variable_get('user_signatures', 0) && !empty($comment->signature)) {