Index: common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.1211
diff -u -p -r1.1211 common.inc
--- common.inc	27 Aug 2010 11:54:32 -0000	1.1211
+++ common.inc	30 Aug 2010 15:03:52 -0000
@@ -2379,7 +2379,7 @@ function drupal_deliver_page($page_callb
   $delivery_callback = !empty($default_delivery_callback) ? $default_delivery_callback : 'drupal_deliver_html_page';
   // Give modules a chance to alter the delivery callback used, based on
   // request-time context (e.g., HTTP request headers).
-  drupal_alter('page_delivery_callback', $delivery_callback);
+  drupal_alter('page_delivery_callback', $delivery_callback, $page_callback_result);
   if (function_exists($delivery_callback)) {
     $delivery_callback($page_callback_result);
   }