diff --git a/core/includes/common.inc b/core/includes/common.inc
index 4163da2..f180421 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -3003,6 +3003,10 @@ function drupal_render(&$elements, $is_root_call = FALSE) {
     }
   }
 
+  // Add additional libraries, CSS, JavaScript an other custom
+  // attached data associated with this elements.
+  drupal_process_attached($elements);
+
   // Rendering is finished, all necessary info collected!
   $bubble_stack();