diff --git a/reference/classobj/reference.xml b/reference/classobj/reference.xml
index 4d65d781a3..afa25bf010 100644
--- a/reference/classobj/reference.xml
+++ b/reference/classobj/reference.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.8 $ -->
+<!-- $Revision: 1.9 $ -->
  <reference id="ref.classobj">
   <title>Class/Object Functions</title>
   <titleabbrev>Classes/Objects</titleabbrev>
@@ -134,8 +134,7 @@ function print_methods($obj) {
 }
 
 function class_parentage($obj, $class) {
-    global $$obj;
-    if (is_subclass_of($$obj, $class)) {
+    if (is_subclass_of($GLOBALS[$obj], $class)) {
         echo "Object $obj belongs to class ".get_class($$obj);
         echo " a subclass of $class\n";
     } else {