diff --git a/lib/Configuration.php b/lib/Configuration.php
index 06edf68b..aa6d15d0 100644
--- a/lib/Configuration.php
+++ b/lib/Configuration.php
@@ -78,6 +78,7 @@ class Configuration
         ),
         'traffic' => array(
             'limit'  => 10,
+            'whitelist' => null,
             'header' => null,
             'dir'    => 'data',
         ),