diff --git a/tests/unit/workflow/engine/methods/cases/CaseMessageHistory_AjaxTest.php b/tests/unit/workflow/engine/methods/cases/CaseMessageHistory_AjaxTest.php
index 03b991a2a..ca44e16c8 100644
--- a/tests/unit/workflow/engine/methods/cases/CaseMessageHistory_AjaxTest.php
+++ b/tests/unit/workflow/engine/methods/cases/CaseMessageHistory_AjaxTest.php
@@ -64,6 +64,8 @@ class CaseMessageHistory_AjaxTest extends TestCase
 
         $_REQUEST['actionAjax'] = "messageHistoryGridList_JXP";
 
+        $_POST['sort'] = 'MSG_UID';
+
         //Turn on output buffering
         ob_start();