diff --git a/tests/src/FunctionalJavascript/ModerationNoteTest.php b/tests/src/FunctionalJavascript/ModerationNoteTest.php
index 61b6ebc..09f5305 100644
--- a/tests/src/FunctionalJavascript/ModerationNoteTest.php
+++ b/tests/src/FunctionalJavascript/ModerationNoteTest.php
@@ -25,6 +25,8 @@ class ModerationNoteTest extends JavascriptTestBase {
   protected function setUp() {
     parent::setUp();
 
+    $GLOBALS['config']['system.mail']['interface']['default'] = 'test_mail_collector';
+
     // Create a Content Type with moderation enabled.
     $node_type = $this->drupalCreateContentType(['type' => 'article', 'name' => 'Article']);
     /* @var \Drupal\workflows\WorkflowInterface $workflow */