diff --git a/core/modules/comment/comment.module b/core/modules/comment/comment.module
index dd87b29..5f56871 100644
--- a/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -1653,7 +1653,7 @@ function template_preprocess_comment(&$variables) {
   }
 
   $uri = $comment->uri();
-  $uri['options'] += array('attributes' => array('class' => 'permalink', 'rel' => 'bookmark'));
+  $uri['options'] += array('attributes' => array('class' => array('permalink'), 'rel' => 'bookmark'));
 
   $variables['title'] = l($comment->subject->value, $uri['path'], $uri['options']);
   $variables['permalink'] = l(t('Permalink'), $uri['path'], $uri['options']);
@@ -1674,7 +1674,7 @@ function template_preprocess_comment(&$variables) {
       $variables['parent_changed'] = format_date($comment_parent->changed->value);
     }
     $uri_parent = $comment_parent->uri();
-    $uri_parent['options'] += array('attributes' => array('class' => 'permalink', 'rel' => 'bookmark'));
+    $uri_parent['options'] += array('attributes' => array('class' => array('permalink'), 'rel' => 'bookmark'));
     $variables['parent_title'] = l($comment_parent->subject->value, $uri_parent['path'], $uri_parent['options']);
     $variables['parent_permalink'] = l(t('Parent permalink'), $uri_parent['path'], $uri_parent['options']);
     $variables['parent'] = t('In reply to !parent_title by !parent_username',