diff --git a/modules/monitoring/application/forms/Command/Object/AcknowledgeProblemCommandForm.php b/modules/monitoring/application/forms/Command/Object/AcknowledgeProblemCommandForm.php
index 3456e1bfb..25ac76c25 100644
--- a/modules/monitoring/application/forms/Command/Object/AcknowledgeProblemCommandForm.php
+++ b/modules/monitoring/application/forms/Command/Object/AcknowledgeProblemCommandForm.php
@@ -104,7 +104,7 @@ class AcknowledgeProblemCommandForm extends ObjectsCommandForm
                 array(
                     'decorators' => array(
                         'FormElements',
-                        array('HtmlTag', array('tag' => 'div', 'class' => 'control-group'))
+                        array('HtmlTag', array('tag' => 'div'))
                     )
                 )
             );