diff --git a/application/controllers/infofix.php b/application/controllers/infofix.php
index 927d6a2a..191ccd8c 100644
--- a/application/controllers/infofix.php
+++ b/application/controllers/infofix.php
@@ -236,7 +236,7 @@ class infofix extends CI_Controller
   function list_use_hb($site)
   {
     $rs = $this->infoContents_model->list_use_hb($site);
-    return $rs;
+    return json_encode($rs);
   }
 
 }