--- conditional_fields.module	2010-10-29 20:15:36.000000000 +0200
+++ conditional_fields_register.module	2010-11-28 01:25:56.013346307 +0100
@@ -309,6 +309,9 @@
     case 'content_copy_import_form':
       $form['#submit'][] = 'conditional_fields_import';
       break;
+    case 'user_register':
+      $form['#after_build'][] = 'conditional_fields_node_after_build';
+      break;
   }
 
   if (isset($form['type']['#value']) && $form_id == $form['type']['#value'] . '_node_form') {