diff --git a/library/Zend/Loader/Autoloader.php b/library/Zend/Loader/Autoloader.php
index a36fe44..f7edc2d 100644
--- a/library/Zend/Loader/Autoloader.php
+++ b/library/Zend/Loader/Autoloader.php
@@ -60,11 +60,13 @@ class Zend_Loader_Autoloader
     protected $_internalAutoloader;
 
     /**
-     * @var array Supported namespaces 'Zend' and 'ZendX' by default.
+     * This used to also support the ZendX pseudo namespace which wasn't
+     * really used anywhere in zendframework1.
+     *
+     * @var array Supported namespace 'Zend' by default.
      */
     protected $_namespaces = array(
         'Zend_'  => true,
-        'ZendX_' => true,
     );
 
     /**