diff --git a/code/controllers/CMSMain.php b/code/controllers/CMSMain.php
index f846055e..d194f861 100644
--- a/code/controllers/CMSMain.php
+++ b/code/controllers/CMSMain.php
@@ -660,6 +660,11 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
 			// if($form->Fields()->hasTabset()) $form->Fields()->findOrMakeTab('Root')->setTemplate('CMSTabSet');
 			$form->setAttribute('data-pjax-fragment', 'CurrentForm');
 
+			// Announce the capability so the frontend can decide whether to allow preview or not.
+			if(in_array('CMSPreviewable', class_implements($record))) {
+				$form->addExtraClass('cms-previewable');
+			}
+
 			if(!$record->canEdit() || $deletedFromStage) {
 				$readonlyFields = $form->Fields()->makeReadonly();
 				$form->setFields($readonlyFields);