diff --git a/code/controllers/CMSPageHistoryController.php b/code/controllers/CMSPageHistoryController.php
index 4b5f9aed..3b05e1db 100644
--- a/code/controllers/CMSPageHistoryController.php
+++ b/code/controllers/CMSPageHistoryController.php
@@ -15,6 +15,8 @@ class CMSPageHistoryController extends CMSMain {
 	
 	static $allowed_actions = array(
 		'VersionsForm',
+		'CompareVersionsForm',
+		'show',
 		'compare'
 	);