Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.1159
diff -u -5 -p -u -r1.1159 common.inc
--- includes/common.inc	1 May 2010 08:12:22 -0000	1.1159
+++ includes/common.inc	4 May 2010 09:49:02 -0000
@@ -4330,12 +4330,12 @@ function drupal_json_decode($var) {
  *
  * @param $var
  *   (optional) If set, the variable will be converted to JSON and output.
  */
 function drupal_json_output($var = NULL) {
-  // We are returning JavaScript, so tell the browser.
-  drupal_add_http_header('Content-Type', 'text/javascript; charset=utf-8');
+  // We are returning JSON, so tell the browser.
+  drupal_add_http_header('Content-Type', 'application/json');
 
   if (isset($var)) {
     echo drupal_json_encode($var);
   }
 }