diff --git a/lib/Doctrine/ORM/AbstractQuery.php b/lib/Doctrine/ORM/AbstractQuery.php
index 5ff47c15a..eb6917b82 100644
--- a/lib/Doctrine/ORM/AbstractQuery.php
+++ b/lib/Doctrine/ORM/AbstractQuery.php
@@ -208,6 +208,7 @@ abstract class AbstractQuery
     {
         $key = trim($key, ':');
 
+        $value = $this->processParameterValue($value);
         if ($type === null) {
             $type = Query\ParameterTypeInferer::inferType($value);
         }
@@ -218,6 +219,53 @@ abstract class AbstractQuery
         return $this;
     }
 
+    /**
+     * Process an individual parameter value
+     *
+     * @param mixed $value
+     * @return array
+     */
+    private function processParameterValue($value)
+    {
+        switch (true) {
+            case is_array($value):
+                for ($i = 0, $l = count($value); $i < $l; $i++) {
+                    $paramValue = $this->processParameterValue($value[$i]);
+                    $value[$i] = is_array($paramValue) ? $paramValue[key($paramValue)] : $paramValue;
+                }
+
+                return $value;
+
+            case is_object($value) && $this->_em->getMetadataFactory()->hasMetadataFor(get_class($value)):
+                return $this->convertObjectParameterToScalarValue($value);
+
+            default:
+                return $value;
+        }
+    }
+
+    protected function convertObjectParameterToScalarValue($value)
+    {
+        $class = $this->_em->getClassMetadata(get_class($value));
+
+        if ($class->isIdentifierComposite) {
+            throw new \InvalidArgumentException("Binding an entity with a composite primary key to a query is not supported. You should split the parameter into the explicit fields and bind them seperately.");
+        }
+
+        if ($this->_em->getUnitOfWork()->getEntityState($value) === UnitOfWork::STATE_MANAGED) {
+            $values = $this->_em->getUnitOfWork()->getEntityIdentifier($value);
+        } else {
+            $values = $class->getIdentifierValues($value);
+        }
+
+        $value = $values[$class->getSingleIdentifierFieldName()];
+        if (!$value) {
+            throw new \InvalidArgumentException("Binding entities to query parameters only allowed for entities that have an identifier.");
+        }
+
+        return $value;
+    }
+
     /**
      * Sets a collection of query parameters.
      *
diff --git a/lib/Doctrine/ORM/Query.php b/lib/Doctrine/ORM/Query.php
index ff3f8426e..16c6c3803 100644
--- a/lib/Doctrine/ORM/Query.php
+++ b/lib/Doctrine/ORM/Query.php
@@ -282,7 +282,8 @@ final class Query extends AbstractQuery
             }
 
             $sqlPositions = $paramMappings[$key];
-            $value = array_values($this->processParameterValue($value));
+            // optimized multi value sql positions away for now, they are not allowed in DQL anyways.
+            $value = array($value);
             $countValue = count($value);
 
             for ($i = 0, $l = count($sqlPositions); $i < $l; $i++) {
@@ -305,39 +306,6 @@ final class Query extends AbstractQuery
         return array($sqlParams, $types);
     }
 
-    /**
-     * Process an individual parameter value
-     *
-     * @param mixed $value
-     * @return array
-     */
-    private function processParameterValue($value)
-    {
-        switch (true) {
-            case is_array($value):
-                for ($i = 0, $l = count($value); $i < $l; $i++) {
-                    $paramValue = $this->processParameterValue($value[$i]);
-
-                    // TODO: What about Entities that have composite primary key?
-                    $value[$i] = is_array($paramValue) ? $paramValue[key($paramValue)] : $paramValue;
-                }
-
-                return array($value);
-
-            case is_object($value) && $this->_em->getMetadataFactory()->hasMetadataFor(get_class($value)):
-                if ($this->_em->getUnitOfWork()->getEntityState($value) === UnitOfWork::STATE_MANAGED) {
-                    return array_values($this->_em->getUnitOfWork()->getEntityIdentifier($value));
-                }
-
-                $class = $this->_em->getClassMetadata(get_class($value));
-
-                return array_values($class->getIdentifierValues($value));
-
-            default:
-                return array($value);
-        }
-    }
-
     /**
      * Defines a cache driver to be used for caching queries.
      *
diff --git a/tests/Doctrine/Tests/ORM/Functional/CompositePrimaryKeyTest.php b/tests/Doctrine/Tests/ORM/Functional/CompositePrimaryKeyTest.php
index 80e2fa0d6..4d321ad04 100644
--- a/tests/Doctrine/Tests/ORM/Functional/CompositePrimaryKeyTest.php
+++ b/tests/Doctrine/Tests/ORM/Functional/CompositePrimaryKeyTest.php
@@ -4,6 +4,7 @@ namespace Doctrine\Tests\ORM\Functional;
 use Doctrine\Tests\Models\Navigation\NavCountry;
 use Doctrine\Tests\Models\Navigation\NavPointOfInterest;
 use Doctrine\Tests\Models\Navigation\NavTour;
+use Doctrine\Tests\Models\Navigation\NavPhotos;
 
 require_once __DIR__ . '/../../TestInit.php';
 
@@ -51,6 +52,25 @@ class CompositePrimaryKeyTest extends \Doctrine\Tests\OrmFunctionalTestCase
         $this->assertEquals('Brandenburger Tor', $poi->getName());
     }
 
+    /**
+     * @group DDC-1651
+     */
+    public function testSetParameterCompositeKeyObject()
+    {
+        $this->putGermanysBrandenburderTor();
+
+        $poi = $this->_em->find('Doctrine\Tests\Models\Navigation\NavPointOfInterest', array('lat' => 100, 'long' => 200));
+        $photo = new NavPhotos($poi, "asdf");
+        $this->_em->persist($photo);
+        $this->_em->flush();
+        $this->_em->clear();
+
+        $dql = 'SELECT t FROM Doctrine\Tests\Models\Navigation\NavPhotos t WHERE t.poi = ?1';
+
+        $this->setExpectedException('Doctrine\ORM\Query\QueryException', 'A single-valued association path expression to an entity with a composite primary key is not supported.');
+        $sql = $this->_em->createQuery($dql)->getSQL();
+    }
+
     public function testManyToManyCompositeRelation()
     {
         $this->putGermanysBrandenburderTor();
@@ -98,4 +118,4 @@ class CompositePrimaryKeyTest extends \Doctrine\Tests\OrmFunctionalTestCase
         $this->setExpectedException('Doctrine\ORM\ORMException', 'The identifier long is missing for a query of Doctrine\Tests\Models\Navigation\NavPointOfInterest');
         $poi = $this->_em->find('Doctrine\Tests\Models\Navigation\NavPointOfInterest', array('key1' => 100));
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Doctrine/Tests/ORM/Functional/QueryTest.php b/tests/Doctrine/Tests/ORM/Functional/QueryTest.php
index 557e4689e..b19a8a6d2 100644
--- a/tests/Doctrine/Tests/ORM/Functional/QueryTest.php
+++ b/tests/Doctrine/Tests/ORM/Functional/QueryTest.php
@@ -599,4 +599,24 @@ class QueryTest extends \Doctrine\Tests\OrmFunctionalTestCase
         $this->assertEquals(3, count($users));
         $this->assertInstanceOf('Doctrine\Tests\Models\CMS\CmsUser', $users[0]);
     }
-}
\ No newline at end of file
+
+    /**
+     * @group DDC-1651
+     */
+    public function testSetParameterBindingSingleIdentifierObjectConverted()
+    {
+        $userC = new CmsUser;
+        $userC->name = 'Jonathan';
+        $userC->username = 'jwage';
+        $userC->status = 'developer';
+        $this->_em->persist($userC);
+
+        $this->_em->flush();
+        $this->_em->clear();
+
+        $q = $this->_em->createQuery("SELECT DISTINCT u from Doctrine\Tests\Models\CMS\CmsUser u WHERE u.id = ?1");
+        $q->setParameter(1, $userC);
+
+        $this->assertEquals($userC->id, $q->getParameter(1));
+    }
+}