diff --git a/enrol/ajax.php b/enrol/ajax.php
index daa4349df79..81c0ede4719 100644
--- a/enrol/ajax.php
+++ b/enrol/ajax.php
@@ -195,6 +195,5 @@ switch ($action) {
         throw new enrol_ajax_exception('unknowajaxaction');
 }
 
-header('Content-type: application/json');
 echo json_encode($outcome);
 die();