diff --git a/tests/acceptance/features/bootstrap/FilesPrimaryS3Context.php b/tests/acceptance/features/bootstrap/FilesPrimaryS3Context.php
index 8cc9c43e..676f8ea8 100644
--- a/tests/acceptance/features/bootstrap/FilesPrimaryS3Context.php
+++ b/tests/acceptance/features/bootstrap/FilesPrimaryS3Context.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * ownCloud
  *
diff --git a/tests/acceptance/features/bootstrap/bootstrap.php b/tests/acceptance/features/bootstrap/bootstrap.php
index 60d93e8f..f318580e 100644
--- a/tests/acceptance/features/bootstrap/bootstrap.php
+++ b/tests/acceptance/features/bootstrap/bootstrap.php
@@ -1,4 +1,4 @@
-<?php
+<?php declare(strict_types=1);
 /**
  * ownCloud
  *