diff --git a/pollanon.module b/pollanon.module
index 5eca626..e0a2d22 100644
--- a/pollanon.module
+++ b/pollanon.module
@@ -41,12 +41,7 @@ function pollanon_form_alter(&$form, &$form_state, $form_id) {
   if ($form_id == 'poll_view_voting' && user_is_anonymous()) {
     $node = $form['#node'];
 
-    if (empty($form['#attributes']['class'])) {
-      $form['#attributes']['class'] = 'pollanon';
-    }
-    else {
-      $form['#attributes']['class'] .= ' pollanon';
-    }
+    $form['#attributes']['class'][] = 'pollanon';
 
     $results = _pollanon_poll_results($node->nid);
     $form['pollanon-poll-results'] = array(