diff --git a/app/code/Magento/Sales/Model/Order/Email/Sender/OrderSender.php b/app/code/Magento/Sales/Model/Order/Email/Sender/OrderSender.php
index 92d00d0436634..f06da0de0fd00 100644
--- a/app/code/Magento/Sales/Model/Order/Email/Sender/OrderSender.php
+++ b/app/code/Magento/Sales/Model/Order/Email/Sender/OrderSender.php
@@ -138,7 +138,7 @@ protected function prepareTemplate(Order $order)
          */
         $this->eventManager->dispatch(
             'email_order_set_template_vars_before',
-            ['sender' => $this, 'transport' => $transportObject->getData(), 'transportObject' => $transportObject]
+            ['sender' => $this, 'transport' => $transportObject, 'transportObject' => $transportObject]
         );
 
         $this->templateContainer->setTemplateVars($transportObject->getData());