diff --git a/includes/advanced_forum_preprocess_comment.inc b/includes/advanced_forum_preprocess_comment.inc
index 432f895..5e5ea9c 100644
--- a/includes/advanced_forum_preprocess_comment.inc
+++ b/includes/advanced_forum_preprocess_comment.inc
@@ -78,7 +78,7 @@ function _advanced_forum_preprocess_comment(&$variables) {
   //  You can erase next 3 lines if you wish to use built-in Permalink.
   //  Template adjusted: $post_link -> $permalink
   $uri = entity_uri('comment', $comment);
-  $uri['options'] += array('attributes' => array('class' => 'permalink', 'rel' => 'bookmark'));
+  $uri['options'] += array('attributes' => array('class' => array('permalink'), 'rel' => 'bookmark'));
   $variables['permalink'] = l($linktext, $uri['path'], $uri['options']);
 
   /* In reply to */
@@ -158,4 +158,4 @@ function _advanced_forum_preprocess_comment(&$variables) {
 
   /* Post edited */
   $variables['post_edited'] = (isset($variables['comment_edited'])) ? $variables['comment_edited'] : "";
-}
\ No newline at end of file
+}