diff --git a/lib/Doctrine/ORM/UnitOfWork.php b/lib/Doctrine/ORM/UnitOfWork.php
index 0a04d05ae..99491d965 100644
--- a/lib/Doctrine/ORM/UnitOfWork.php
+++ b/lib/Doctrine/ORM/UnitOfWork.php
@@ -1700,21 +1700,18 @@ class UnitOfWork implements PropertyChangedListener
                             // do not merge fields marked lazy that have not been fetched.
                             continue;
                         } else if ( ! $assoc2['isCascadeMerge']) {
-                            if ($this->getEntityState($other, self::STATE_DETACHED) == self::STATE_MANAGED) {
-                                $prop->setValue($managedCopy, $other);
-                            } else {
-
+                            if ($this->getEntityState($other, self::STATE_DETACHED) !== self::STATE_MANAGED) {
                                 $targetClass = $this->em->getClassMetadata($assoc2['targetEntity']);
                                 $relatedId = $targetClass->getIdentifierValues($other);
 
                                 if ($targetClass->subClasses) {
-                                    $entity = $this->em->find($targetClass->name, $relatedId);
+                                    $other = $this->em->find($targetClass->name, $relatedId);
                                 } else {
-                                    $proxy = $this->em->getProxyFactory()->getProxy($assoc2['targetEntity'], $relatedId);
-                                    $prop->setValue($managedCopy, $proxy);
-                                    $this->registerManaged($proxy, $relatedId, array());
+                                    $other = $this->em->getProxyFactory()->getProxy($assoc2['targetEntity'], $relatedId);
+                                    $this->registerManaged($other, $relatedId, array());
                                 }
                             }
+                            $prop->setValue($managedCopy, $other);
                         }
                     } else {
                         $mergeCol = $prop->getValue($entity);
diff --git a/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC1509Test.php b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC1509Test.php
new file mode 100644
index 000000000..7f7e7d575
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC1509Test.php
@@ -0,0 +1,146 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\ORM\UnitOfWork;
+
+/**
+ * @group DDC-1509
+ */
+class DDC1509Test extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+
+    protected function setUp()
+    {
+        parent::setUp();
+
+        try {
+            $this->_schemaTool->createSchema(array(
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\DDC1509AbstractFile'),
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\DDC1509File'),
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\DDC1509Picture'),
+            ));
+        } catch (\Exception $ignored) {
+            
+        }
+    }
+
+    public function testFailingCase()
+    {
+        $file = new DDC1509File;
+        $thumbnail = new DDC1509File;
+
+        $picture = new DDC1509Picture;
+        $picture->setFile($file);
+        $picture->setThumbnail($thumbnail);
+
+
+        /* @var $em \Doctrine\ORM\EntityManager */
+        $em = $this->_em;
+        $em->persist($picture);
+        $em->flush();
+        $em->clear();
+
+        $id = $picture->getPictureId();
+
+        $pic = $em->merge($picture);
+        /* @var $pic DDC1509Picture */
+
+        $this->assertNotNull($pic->getThumbnail());
+        $this->assertNotNull($pic->getFile());
+    }
+
+}
+
+/**
+ * @Entity
+ */
+class DDC1509Picture
+{
+
+    /**
+     * @Column(type="integer")
+     * @Id
+     * @GeneratedValue(strategy="AUTO")
+     */
+    private $id;
+
+    /**
+     * @ManyToOne(targetEntity="DDC1509AbstractFile", cascade={"persist", "remove"})
+     */
+    private $thumbnail;
+
+    /**
+     * @ManyToOne(targetEntity="DDC1509AbstractFile", cascade={"persist", "remove"})
+     */
+    private $file;
+
+    /**
+     * Get pictureId
+     */
+    public function getPictureId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * Set file
+     */
+    public function setFile($value = null)
+    {
+        $this->file = $value;
+    }
+
+    /**
+     * Get file
+     */
+    public function getFile()
+    {
+        return $this->file;
+    }
+
+    public function getThumbnail()
+    {
+        return $this->thumbnail;
+    }
+
+    public function setThumbnail($thumbnail)
+    {
+        $this->thumbnail = $thumbnail;
+    }
+
+}
+
+/**
+ * @Entity
+ * @InheritanceType("SINGLE_TABLE")
+ * @DiscriminatorColumn(name="discr", type="string")
+ * @DiscriminatorMap({"file" = "DDC1509File"})
+ */
+class DDC1509AbstractFile
+{
+
+    /**
+     * @Column(type="integer")
+     * @Id
+     * @GeneratedValue(strategy="AUTO")
+     */
+    public $id;
+
+    /**
+     * Get fileId
+     */
+    public function getFileId()
+    {
+        return $this->id;
+    }
+
+}
+
+/**
+ * @Entity
+ */
+class DDC1509File extends DDC1509AbstractFile
+{
+    
+}