diff --git a/base.php b/base.php
index 4954d67..21e0538 100644
--- a/base.php
+++ b/base.php
@@ -214,6 +214,7 @@ class LinkFacet extends Link
 {
     public function __construct($phref, $ptitle = NULL, $pfacetGroup = NULL, $pactiveFacet = FALSE) {
         parent::__construct ($phref, Link::OPDS_PAGING_TYPE, "http://opds-spec.org/facet", $ptitle, $pfacetGroup, $pactiveFacet);
+        if (!is_null (GetUrlParam (DB))) $this->href = addURLParameter ($this->href, DB, GetUrlParam (DB));
         $this->href = $_SERVER["SCRIPT_NAME"] . $this->href;
     }
 }