diff --git a/bbb_broker.php b/bbb_broker.php
index a6ad326b0..f3299d5be 100644
--- a/bbb_broker.php
+++ b/bbb_broker.php
@@ -48,7 +48,7 @@
     }
 }
 
-header('Content-Type: application/json; charset=utf-8');
+header('Content-Type: application/javascript; charset=utf-8');
 if ( empty($error) ) {
 
     if (!isloggedin() && $PAGE->course->id == SITEID) {