diff --git a/lib/Doctrine/ORM/UnitOfWork.php b/lib/Doctrine/ORM/UnitOfWork.php
index c2f037e2d..184b291da 100644
--- a/lib/Doctrine/ORM/UnitOfWork.php
+++ b/lib/Doctrine/ORM/UnitOfWork.php
@@ -3422,8 +3422,6 @@ class UnitOfWork implements PropertyChangedListener
                         );
                         $managedCol->setOwner($managedCopy, $assoc2);
                         $prop->setValue($managedCopy, $managedCol);
-
-                        $this->originalEntityData[spl_object_hash($entity)][$name] = $managedCol;
                     }
 
                     if ($assoc2['isCascadeMerge']) {
diff --git a/tests/Doctrine/Tests/ORM/UnitOfWorkTest.php b/tests/Doctrine/Tests/ORM/UnitOfWorkTest.php
index 9623cfbf4..306fceaba 100644
--- a/tests/Doctrine/Tests/ORM/UnitOfWorkTest.php
+++ b/tests/Doctrine/Tests/ORM/UnitOfWorkTest.php
@@ -12,6 +12,8 @@ use Doctrine\Tests\Mocks\DriverMock;
 use Doctrine\Tests\Mocks\EntityManagerMock;
 use Doctrine\Tests\Mocks\EntityPersisterMock;
 use Doctrine\Tests\Mocks\UnitOfWorkMock;
+use Doctrine\Tests\Models\CMS\CmsPhonenumber;
+use Doctrine\Tests\Models\CMS\CmsUser;
 use Doctrine\Tests\Models\Forum\ForumAvatar;
 use Doctrine\Tests\Models\Forum\ForumUser;
 use Doctrine\Tests\Models\GeoNames\City;
@@ -362,6 +364,34 @@ class UnitOfWorkTest extends \Doctrine\Tests\OrmTestCase
             [new ArrayCollection()],
         ];
     }
+
+    /**
+     * @group 5689
+     * @group 1465
+     */
+    public function testObjectHashesOfMergedEntitiesAreNotUsedInOriginalEntityDataMap()
+    {
+        $user       = new CmsUser();
+        $user->name = 'ocramius';
+        $mergedUser = $this->_unitOfWork->merge($user);
+
+        self::assertSame([], $this->_unitOfWork->getOriginalEntityData($user), 'No original data was stored');
+        self::assertSame([], $this->_unitOfWork->getOriginalEntityData($mergedUser), 'No original data was stored');
+
+
+        $user       = null;
+        $mergedUser = null;
+
+        // force garbage collection of $user (frees the used object hashes, which may be recycled)
+        gc_collect_cycles();
+
+        $newUser       = new CmsUser();
+        $newUser->name = 'ocramius';
+
+        $this->_unitOfWork->persist($newUser);
+
+        self::assertSame([], $this->_unitOfWork->getOriginalEntityData($newUser), 'No original data was stored');
+    }
 }
 
 /**