diff --git a/extension.driver.php b/extension.driver.php
index 4d4739e..72dad98 100644
--- a/extension.driver.php
+++ b/extension.driver.php
@@ -4,7 +4,7 @@
 
 	Class Extension_UnionDatasource extends Extension {
 
-		private static $provides = array();
+		protected static $provides = array();
 
 		public static function registerProviders() {
 			self::$provides = array(