diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index c43e725..6a57f1c 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -2124,7 +2124,7 @@ function template_preprocess_comment(&$variables) {
   $variables['signature'] = $comment->signature;
 
   $uri = entity_uri('comment', $comment);
-  $uri['options'] += array('attributes' => array('class' => 'permalink', 'rel' => 'bookmark'));
+  $uri['options'] += array('attributes' => array('class' => array('permalink'), 'rel' => 'bookmark'));
 
   $variables['title'] = l($comment->subject, $uri['path'], $uri['options']);
   $variables['permalink'] = l(t('Permalink'), $uri['path'], $uri['options']);