diff --git a/templates/SilverStripe/CMS/Controllers/Includes/CMSMain_PreviewPanel.ss b/templates/SilverStripe/CMS/Controllers/Includes/CMSMain_PreviewPanel.ss
index ba3bbca1..7c112d3d 100644
--- a/templates/SilverStripe/CMS/Controllers/Includes/CMSMain_PreviewPanel.ss
+++ b/templates/SilverStripe/CMS/Controllers/Includes/CMSMain_PreviewPanel.ss
@@ -1,6 +1,6 @@
 <div class="cms-preview east" data-layout-type="border">
 	<div class="preview-note"><span><!-- --></span><%t CMSPageHistoryController_versions_ss.PREVIEW 'Website preview' %></div>
-	<div class="panel-scrollable panel-scrollable--single-toolbar">
+	<div class="panel panel--scrollable panel--single-toolbar">
 		<div class="preview-device-outer">
 			<div class="preview-device-inner">
 				<iframe src="about:blank" class="center" name="cms-preview-iframe"></iframe>