diff --git a/lib/Doctrine/ORM/EntityManager.php b/lib/Doctrine/ORM/EntityManager.php
index cd433a7fa..d075d418c 100644
--- a/lib/Doctrine/ORM/EntityManager.php
+++ b/lib/Doctrine/ORM/EntityManager.php
@@ -378,16 +378,22 @@ use Doctrine\Common\Util\ClassUtils;
     {
         $class = $this->metadataFactory->getMetadataFor(ltrim($entityName, '\\'));
 
-        if (is_object($id) && $this->metadataFactory->hasMetadataFor(ClassUtils::getClass($id))) {
-            $id = $this->unitOfWork->getSingleIdentifierValue($id);
-
-            if ($id === null) {
-                throw ORMInvalidArgumentException::invalidIdentifierBindingEntity();
+        if ( ! is_array($id)) {
+            if ($class->isIdentifierComposite) {
+                throw ORMInvalidArgumentException::invalidCompositeIdentifier();
             }
+
+            $id = array($class->identifier[0] => $id);
         }
 
-        if ( ! is_array($id)) {
-            $id = array($class->identifier[0] => $id);
+        foreach ($id as $i => $value) {
+            if (is_object($value) && $this->metadataFactory->hasMetadataFor(ClassUtils::getClass($value))) {
+                $id[$i] = $this->unitOfWork->getSingleIdentifierValue($value);
+
+                if ($id[$i] === null) {
+                    throw ORMInvalidArgumentException::invalidIdentifierBindingEntity();
+                }
+            }
         }
 
         $sortedId = array();
diff --git a/tests/Doctrine/Tests/Models/Taxi/Car.php b/tests/Doctrine/Tests/Models/Taxi/Car.php
index 2db5ecd36..03cc74c96 100644
--- a/tests/Doctrine/Tests/Models/Taxi/Car.php
+++ b/tests/Doctrine/Tests/Models/Taxi/Car.php
@@ -29,6 +29,11 @@ class Car
      * @OneToMany(targetEntity="PaidRide", mappedBy="car")
      */
     private $carRides;
+    
+    public function getBrand() 
+    {
+        return $this->brand;
+    }
 
     public function setBrand($brand)
     {
diff --git a/tests/Doctrine/Tests/Models/Taxi/Driver.php b/tests/Doctrine/Tests/Models/Taxi/Driver.php
index ccb493f1d..ff0cb41a4 100644
--- a/tests/Doctrine/Tests/Models/Taxi/Driver.php
+++ b/tests/Doctrine/Tests/Models/Taxi/Driver.php
@@ -29,6 +29,11 @@ class Driver
      * @OneToMany(targetEntity="PaidRide", mappedBy="driver")
      */
     private $driverRides;
+    
+    public function getId()
+    {
+        return $this->id;
+    }
 
     public function setName($name)
     {
diff --git a/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC3068Test.php b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC3068Test.php
new file mode 100644
index 000000000..d43e35563
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC3068Test.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\Tests\Models\Taxi\Car;
+use Doctrine\Tests\Models\Taxi\Driver;
+use Doctrine\Tests\Models\Taxi\Ride;
+
+/**
+ * @group DDC-3068
+ * 
+ * @author Giorgio Premi <giosh94mhz@gmail.com>
+ */
+class DDC3068Test extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+    private $foo;
+    private $merc;
+
+    protected function setUp()
+    {
+        $this->useModelSet('taxi');
+        parent::setUp();
+
+        $this->foo = new Driver();
+        $this->foo->setName('Foo Bar');
+        $this->_em->persist($this->foo);
+
+        $this->merc = new Car();
+        $this->merc->setBrand('Mercedes');
+        $this->merc->setModel('C-Class');
+        $this->_em->persist($this->merc);
+
+        $this->_em->flush();
+
+        $ride = new Ride($this->foo, $this->merc);
+        $this->_em->persist($ride);
+
+        $this->_em->flush();
+    }
+
+    public function testFindUsingAnArrayOfObjectAsPrimaryKey()
+    {
+        $ride1 = $this->_em->find('Doctrine\Tests\Models\Taxi\Ride', array(
+            'driver' => $this->foo->getId(),
+            'car'    => $this->merc->getBrand())
+        );
+
+        $this->assertInstanceOf('Doctrine\Tests\Models\Taxi\Ride', $ride1);
+
+        $ride2 = $this->_em->find('Doctrine\Tests\Models\Taxi\Ride', array(
+            'driver' => $this->foo,
+            'car'    => $this->merc
+        ));
+
+        $this->assertInstanceOf('Doctrine\Tests\Models\Taxi\Ride', $ride2);
+        $this->assertSame($ride1, $ride2);
+    }
+}