diff --git a/lib/purifier/HTMLPurifier.autoload.php b/lib/purifier/HTMLPurifier.autoload.php
index 63193c3ee7..c3995b91f0 100644
--- a/lib/purifier/HTMLPurifier.autoload.php
+++ b/lib/purifier/HTMLPurifier.autoload.php
@@ -9,12 +9,12 @@
 if (function_exists('spl_autoload_register') && function_exists('spl_autoload_unregister')) {
     // We need unregister for our pre-registering functionality
     HTMLPurifier_Bootstrap::registerAutoload();
-    if (function_exists('__autoload')) {
+    if (function_exists('purifierAutoload')) {
         // Be polite and ensure that userland autoload gets retained
-        spl_autoload_register('__autoload');
+        spl_autoload_register('purifierAutoload');
     }
-} elseif (!function_exists('__autoload')) {
-    function __autoload($class)
+} elseif (!function_exists('purifierAutoload')) {
+    function purifierAutoload($class)
     {
         return HTMLPurifier_Bootstrap::autoload($class);
     }