diff --git a/code/VersionFeed.php b/code/VersionFeed.php
index bd2ec6d..1ad182d 100644
--- a/code/VersionFeed.php
+++ b/code/VersionFeed.php
@@ -1,11 +1,12 @@
 <?php
 
 class VersionFeed extends SiteTreeExtension {
-	static $db = array(
+	
+	private static $db = array(
 		'PublicHistory' => 'Boolean'
 	);
 
-	static $defaults = array(
+	private static $defaults = array(
 		'PublicHistory' => true
 	);
 
diff --git a/code/VersionFeed_Controller.php b/code/VersionFeed_Controller.php
index 3f31ea0..a1f22b3 100644
--- a/code/VersionFeed_Controller.php
+++ b/code/VersionFeed_Controller.php
@@ -2,7 +2,7 @@
 
 class VersionFeed_Controller extends Extension {
 
-	static $allowed_actions = array(
+	private static $allowed_actions = array(
 		'changes',
 		'allchanges'
 	);