diff --git a/themes/bootstrap/templates/search/searchbox.phtml b/themes/bootstrap/templates/search/searchbox.phtml
index 5d2b81bff6f19db418108f8d251e02538ef6e7cd..a3ecfdb79eb03b04fd6b8266be896f2d444707b0 100644
--- a/themes/bootstrap/templates/search/searchbox.phtml
+++ b/themes/bootstrap/templates/search/searchbox.phtml
@@ -106,6 +106,10 @@
         </div>
       <? endif; ?>
       <?
+      /* Show hidden field for active search class when in combined handler mode. */
+      if ($this->searchbox()->combinedHandlersActive()) {
+        echo '<input type="hidden" name="activeSearchClassId" value="' . $this->escapeHtml($this->searchClassId) . '" />';
+      }
       /* Load hidden limit preference from Session */
       if (!empty($lastLimit)) {
         echo '<input type="hidden" name="limit" value="' . $this->escapeHtml($lastLimit) . '" />';