diff --git a/tests/integration/WooCommerce/TransactionalEmailHooksTest.php b/tests/integration/WooCommerce/TransactionalEmailHooksTest.php
index d78c3a3b02..1cdc3a5ea5 100644
--- a/tests/integration/WooCommerce/TransactionalEmailHooksTest.php
+++ b/tests/integration/WooCommerce/TransactionalEmailHooksTest.php
@@ -156,6 +156,7 @@ class TransactionalEmailHooksTest extends \MailPoetTest {
         return 'prefixed ' . $css;
       },
     ]);
+    $wcEmails = $this->makeEmpty("\WC_Emails");
 
     $transactionalEmails = new TransactionalEmailHooks(
       $wp,
@@ -165,7 +166,7 @@ class TransactionalEmailHooksTest extends \MailPoetTest {
     $transactionalEmails->useTemplateForWoocommerceEmails();
     expect($addedActions)->count(1);
     expect($addedActions['woocommerce_email'])->callable();
-    $addedActions['woocommerce_email'](new \stdClass());
+    $addedActions['woocommerce_email']($wcEmails);
     expect($removedActions)->count(2);
     expect($addedActions)->count(4);
     expect($addedActions['woocommerce_email_header'])->callable();
diff --git a/tests/integration/_bootstrap.php b/tests/integration/_bootstrap.php
index 0756647469..2ac0fa5950 100644
--- a/tests/integration/_bootstrap.php
+++ b/tests/integration/_bootstrap.php
@@ -267,6 +267,8 @@ if (!function_exists('WC')) {
     public function get_product_id() { // phpcs:ignore
     }
   }
+
+  class WC_Emails {} // phpcs:ignore
 }
 
 require_once '_fixtures.php';