diff --git a/themes/jquerymobile/templates/search/advanced.phtml b/themes/jquerymobile/templates/search/advanced.phtml
index 8e51c3ba54b40612bc665a61083c89fd6aa8aef2..cdfb2b9c578f8ed16e45e86d2a1acfaa24f53e9c 100644
--- a/themes/jquerymobile/templates/search/advanced.phtml
+++ b/themes/jquerymobile/templates/search/advanced.phtml
@@ -19,6 +19,7 @@
   <div data-role="content">
     <!-- SEARCH BOXES -->
     <form method="get" action="<?=$this->url($basicSearch)?>" data-ajax="false">
+      <input type="hidden" name="join" value="AND" />
       <fieldset class="ui-grid-a">
       <? for ($i = 0; $i < 3; $i++): ?>
         <div class="ui-block-a">