diff --git a/modules/monitoring/application/forms/Command/CommandForm.php b/modules/monitoring/application/forms/Command/CommandForm.php
index 1e458a44e..9ccdd0f9b 100644
--- a/modules/monitoring/application/forms/Command/CommandForm.php
+++ b/modules/monitoring/application/forms/Command/CommandForm.php
@@ -116,7 +116,7 @@ abstract class CommandForm extends Form
     public function getValidDateTimeFormats()
     {
         // TODO(mh): Missing localized format (#6077)
-        return 'd/m/Y g:i A';
+        return array('d/m/Y g:i A');
     }
 
     /**