diff --git a/lib/Doctrine/ORM/Query/Parser.php b/lib/Doctrine/ORM/Query/Parser.php
index 7e1fe6d45..2046c7689 100644
--- a/lib/Doctrine/ORM/Query/Parser.php
+++ b/lib/Doctrine/ORM/Query/Parser.php
@@ -140,7 +140,6 @@ class Parser
         $this->_em = $query->getEntityManager();
         $this->_lexer = new Lexer($query->getDql());
         $this->_parserResult = new ParserResult();
-        $this->_ast = null;
     }
 
     /**