diff --git a/administrator/templates/atum/index.php b/administrator/templates/atum/index.php
index 02c55d8618a68..c5afa3968da5f 100644
--- a/administrator/templates/atum/index.php
+++ b/administrator/templates/atum/index.php
@@ -95,7 +95,7 @@
 	<jdoc:include type="styles" />
 </head>
 
-<body class="admin <?php echo $option . ' view-' . $view . ' layout-' . $layout . ($task ? ' task-' . $task : '') . ($monochrome ? ' monochrome' : '') . ($a11y_mono ? ' monochrome' : '') . ($a11y_contrast ? ' a11y_contrast' : '') . ($a11y_highlight ? ' a11y_highlight' : ''); ?>">
+<body class="admin <?php echo $option . ' view-' . $view . ' layout-' . $layout . ($task ? ' task-' . $task : '') . ($monochrome || $a11y_mono ? ' monochrome' : '') . ($a11y_contrast ? ' a11y_contrast' : '') . ($a11y_highlight ? ' a11y_highlight' : ''); ?>">
 <noscript>
 	<div class="alert alert-danger" role="alert">
 		<?php echo Text::_('JGLOBAL_WARNJAVASCRIPT'); ?>
