diff --git a/tests/UnassignConversationTest.php b/tests/UnassignConversationTest.php
index 624d39b3..8fdfac8d 100644
--- a/tests/UnassignConversationTest.php
+++ b/tests/UnassignConversationTest.php
@@ -27,7 +27,7 @@ public function testUnassign()
     private function getConversation()
     {
         $conversation = new Conversation((object)[
-            'threads' => [],
+            'threads' => array(),
             'createdBy' => 12345
         ]);
         $conversation->setMailbox(new MailboxRef);