diff --git a/classes/Memcached_DataObject.php b/classes/Memcached_DataObject.php
index cf7fb4340a..f511335083 100644
--- a/classes/Memcached_DataObject.php
+++ b/classes/Memcached_DataObject.php
@@ -253,18 +253,6 @@ class Memcached_DataObject extends DB_DataObject
         return new ArrayWrapper($cached);
     }
 
-    function cleanup()
-    {
-        global $_DB_DATAOBJECT;
-
-        if (isset($_DB_DATAOBJECT['RESULTFIELDS'][$this->_DB_resultid])) {
-            unset($_DB_DATAOBJECT['RESULTFIELDS'][$this->_DB_resultid]);
-        }
-        if (isset($_DB_DATAOBJECT['RESULTS'][$this->_DB_resultid])) {
-            unset($_DB_DATAOBJECT['RESULTS'][$this->_DB_resultid]);
-        }
-    }
-
     // We overload so that 'SET NAMES "utf8"' is called for
     // each connection