diff --git a/includes/helper.inc b/includes/helper.inc
index c1a1aee..cd56fc9 100644
--- a/includes/helper.inc
+++ b/includes/helper.inc
@@ -1574,7 +1574,7 @@ function _mbase_links(&$variables) {
           $link_icon = $link_icon . ' ';
         }
         $link_class = _mbase_colorize_text($link['title'], 'primary');
-        $link['attributes']['class'][] = 'btn';
+        $link['attributes']['class'] = array($link['attributes']['class'],'btn');
         $link['attributes']['class'][] = 'btn-xs';
         if ($link_class) {
           $link['attributes']['class'][] = 'btn-' . $link_class;;