diff --git a/field_group.module b/field_group.module
index 1081e8c0..99570049 100644
--- a/field_group.module
+++ b/field_group.module
@@ -734,7 +734,7 @@ function field_group_pre_render_div(&$element, $group, &$form) {
 
   $element['#type'] = 'markup';
   if ($group->format_settings['formatter'] != 'open') {
-    $element['#prefix'] = '<div id="' . $element['#id'] . '" class="' . $group->classes . '">
+    $element['#prefix'] = '<div class="' . $group->classes . '">
       <' . $label_element . '><span class="field-group-format-toggler">' . check_plain(t($group->label)) . '</span></' . $label_element . '>
       <div class="field-group-format-wrapper" style="display: ' . (!empty($group->collapsed) ? 'none' : 'block') . ';">';
     $element['#suffix'] = '</div></div>';