diff --git a/app/code/community/Lesti/Fpc/Helper/Data.php b/app/code/community/Lesti/Fpc/Helper/Data.php
index 7a89788..0d65dda 100644
--- a/app/code/community/Lesti/Fpc/Helper/Data.php
+++ b/app/code/community/Lesti/Fpc/Helper/Data.php
@@ -182,7 +182,7 @@ protected function _getLayeredNavigationAttributes()
             $layeredNavigationAttributesCache = $cache->load($cacheId);
 
             if (!$layeredNavigationAttributesCache) {
-                $attributeCollection->addFieldToFilter($filterableField, true);
+                $attributeCollection->addFieldToFilter($filterableField, array('in' => array(1,2)));
                 foreach ($attributeCollection as $attribute) {
                     $layeredNavigationAttributes[] = $attribute->getAttributeCode();
                 }