diff --git a/mobile.netbiblio.php b/mobile.netbiblio.php
index 5cdc45b..770e1ec 100644
--- a/mobile.netbiblio.php
+++ b/mobile.netbiblio.php
@@ -294,6 +294,7 @@ class NetBiblio extends WebService
     {
         $query = array(
             'queryText' => $query,
+            'queryType' => is_numeric($query) && strlen($query) <= 5 ? 'code' : 'text',
             'count' => $limit,
             'page' => ($start / $limit),
         );