diff --git a/lib/exe/ajax.php b/lib/exe/ajax.php
index 1c1b5f03fcfcfd21fb80f42cea9afa59135361ec..b3e9a618f565143707904fd89770accba787111f 100644
--- a/lib/exe/ajax.php
+++ b/lib/exe/ajax.php
@@ -303,7 +303,8 @@ function ajax_mediaupload(){
         );
     }
     $json = new JSON;
-    echo htmlspecialchars($json->encode($result), ENT_NOQUOTES);
+    header('Content-Type: application/json');
+    echo $json->encode($result);
 }
 
 /**