diff --git a/lib/Doctrine/ORM/Query/QueryException.php b/lib/Doctrine/ORM/Query/QueryException.php
index f2fb61c71..16a10856a 100644
--- a/lib/Doctrine/ORM/Query/QueryException.php
+++ b/lib/Doctrine/ORM/Query/QueryException.php
@@ -248,7 +248,7 @@ class QueryException extends \Doctrine\ORM\ORMException
     public static function instanceOfUnrelatedClass($className, $rootClass)
     {
         return new self("Cannot check if a child of '" . $rootClass . "' is instanceof '" . $className . "', " .
-                "inheritance hierarchy exists between these two classes.");
+                "inheritance hierarchy does not exists between these two classes.");
     }
 
     /**