diff --git a/src/SemanticScuttle/header.php b/src/SemanticScuttle/header.php
index 5d1ec80..8668bbb 100644
--- a/src/SemanticScuttle/header.php
+++ b/src/SemanticScuttle/header.php
@@ -104,7 +104,7 @@ T_bind_textdomain_codeset($domain, 'UTF-8');
 T_textdomain($domain);
 
 // 4 // Session
-if (!defined('UNIT_TEST_MODE')) {
+if (!defined('UNIT_TEST_MODE') || defined('HTTP_UNIT_TEST_MODE')) {
     session_start();
     if ($GLOBALS['enableVoting']) {
         if (isset($_SESSION['lastUrl'])) {