diff --git a/tests/notification/notification_method_email_test.php b/tests/notification/notification_method_email_test.php
index 94b816434c..20ee0ef181 100644
--- a/tests/notification/notification_method_email_test.php
+++ b/tests/notification/notification_method_email_test.php
@@ -34,7 +34,7 @@ class notification_method_email_test extends phpbb_tests_notification_base
 		);
 	}
 
-	protected function setUp()
+	protected function setUp() : void
 	{
 		phpbb_database_test_case::setUp();