diff --git a/commerce_checkout_progress.module b/commerce_checkout_progress.module
index 663ae490b01da6ccebf4fcaa4ec8d6e53d250009..a69937defe14f5e39d7d2b59b610c6d6ba064a96 100644
--- a/commerce_checkout_progress.module
+++ b/commerce_checkout_progress.module
@@ -215,13 +215,13 @@ function theme_commerce_checkout_progress_list($variables) {
   return theme('item_list', array(
     'items' => $progress,
     'type' => $type,
-    'attributes' => array('class' => array('commerce-checkout-progress', 'clearfix', 'inline',)),
+    'attributes' => array('class' => array('commerce-checkout-progress', 'clearfix', 'inline','checkout-pages-' . count($progress))),
   ));
 }
 
 /**
  * Implements hook_form_FORM_ID_alter().
- * 
+ *
  * @see commerce_checkout_progress_get_items().
  */
 function commerce_checkout_progress_form_commerce_checkout_builder_form_alter(&$form, $form_state, $form_id) {
@@ -254,7 +254,7 @@ function commerce_checkout_progress_form_commerce_checkout_builder_form_alter(&$
 
 /**
  * Custom submit function to save module settings after form submit.
- * 
+ *
  * @see commerce_checkout_progress_form_commerce_checkout_builder_form_alter().
  * @see commerce_checkout_progress_get_items().
  */