diff --git a/lib/Doctrine/ORM/QueryBuilder.php b/lib/Doctrine/ORM/QueryBuilder.php
index 7206ec4ab..76d2e506c 100644
--- a/lib/Doctrine/ORM/QueryBuilder.php
+++ b/lib/Doctrine/ORM/QueryBuilder.php
@@ -1047,8 +1047,8 @@ class QueryBuilder
      * Specifies an ordering for the query results.
      * Replaces any previously specified orderings, if any.
      *
-     * @param string $sort  The ordering expression.
-     * @param string $order The ordering direction.
+     * @param string|Expr\OrderBy $sort  The ordering expression.
+     * @param string              $order The ordering direction.
      *
      * @return QueryBuilder This QueryBuilder instance.
      */
@@ -1062,14 +1062,16 @@ class QueryBuilder
     /**
      * Adds an ordering to the query results.
      *
-     * @param string $sort  The ordering expression.
-     * @param string $order The ordering direction.
+     * @param string|Expr\OrderBy $sort  The ordering expression.
+     * @param string              $order The ordering direction.
      *
      * @return QueryBuilder This QueryBuilder instance.
      */
     public function addOrderBy($sort, $order = null)
     {
-        return $this->add('orderBy', new Expr\OrderBy($sort, $order), true);
+        $orderBy = ($sort instanceof Expr\OrderBy) ? $sort : new Expr\OrderBy($sort, $order);
+
+        return $this->add('orderBy', $orderBy, true);
     }
 
     /**
diff --git a/tests/Doctrine/Tests/ORM/QueryBuilderTest.php b/tests/Doctrine/Tests/ORM/QueryBuilderTest.php
index 6630bd3d6..19e0c0e95 100644
--- a/tests/Doctrine/Tests/ORM/QueryBuilderTest.php
+++ b/tests/Doctrine/Tests/ORM/QueryBuilderTest.php
@@ -375,6 +375,17 @@ class QueryBuilderTest extends \Doctrine\Tests\OrmTestCase
         $this->assertValidQueryBuilder($qb, 'SELECT u FROM Doctrine\Tests\Models\CMS\CmsUser u ORDER BY u.username ASC, u.username DESC');
     }
 
+    public function testAddOrderByWithExpression()
+    {
+        $qb = $this->_em->createQueryBuilder();
+        $qb->select('u')
+            ->from('Doctrine\Tests\Models\CMS\CmsUser', 'u')
+            ->orderBy('u.username', 'ASC')
+            ->addOrderBy($qb->expr()->desc('u.username'));
+
+        $this->assertValidQueryBuilder($qb, 'SELECT u FROM Doctrine\Tests\Models\CMS\CmsUser u ORDER BY u.username ASC, u.username DESC');
+    }
+
     public function testAddCriteriaWhere()
     {
         $qb = $this->_em->createQueryBuilder();