diff --git a/tests/class-activitypub-testcase-cache-http.php b/tests/class-activitypub-testcase-cache-http.php
index 3277c03..b8b0e43 100644
--- a/tests/class-activitypub-testcase-cache-http.php
+++ b/tests/class-activitypub-testcase-cache-http.php
@@ -1,6 +1,6 @@
 <?php
 class ActivityPub_TestCase_Cache_HTTP extends \WP_UnitTestCase {
-
+	public $server;
 	public function set_up() {
 		parent::set_up();