diff --git a/Configuration/DefaultConfiguration.php b/Configuration/DefaultConfiguration.php
index 880a4c6063..c3a50ee72f 100644
--- a/Configuration/DefaultConfiguration.php
+++ b/Configuration/DefaultConfiguration.php
@@ -1430,6 +1430,7 @@
                 // Piwik
                 'pk_campaign',
                 'pk_kwd',
+                '_stg_debug',
                 // Google
                 'utm_source',
                 'utm_medium',