diff --git a/system/codeigniter/Base5.php b/system/codeigniter/Base5.php
index a0beea4..e37c257 100644
--- a/system/codeigniter/Base5.php
+++ b/system/codeigniter/Base5.php
@@ -32,7 +32,7 @@
 
 class CI_Base {
 
-    public static $instance;
+    private static $instance;
 
     public function CI_Base()
     {