diff --git a/wx/Miniprogarampage.php b/wx/Miniprogarampage.php
index 4261d9b..5ca6dd9 100644
--- a/wx/Miniprogarampage.php
+++ b/wx/Miniprogarampage.php
@@ -15,7 +15,7 @@ abstract class Miniprogarampage
 	protected $config;
 
 	/** @var mixed $instance */
-	private static $instance = null;
+	protected static $instance = null;
 
 	/** @var WxClient */
 	protected $request = null;