diff --git a/src/GlobalSign.php b/src/GlobalSign.php
index eaff8a4..d71f914 100644
--- a/src/GlobalSign.php
+++ b/src/GlobalSign.php
@@ -531,6 +531,7 @@ public function OVOrder($fqdn, $csr, $orderId, $approverEmail, $firstname, $last
 					],
 					'OrderID' => $orderId,
 					'ApproverEmail' => $approverEmail,
+					'SubID' => null,
 					'OrganizationInfo' => [
 						'OrganizationName' => $company, 'OrganizationAddress' => [
 						'AddressLine1' => $address,