diff --git a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
index 62ea7bb9b..ba7a2d2df 100644
--- a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
+++ b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
@@ -852,6 +852,10 @@ class ClassMetadataInfo implements ClassMetadata
             $serialized[] = 'isMappedSuperclass';
         }
 
+        if ($this->isEmbeddedClass) {
+            $serialized[] = 'isEmbeddedClass';
+        }
+
         if ($this->containsForeignIdentifier) {
             $serialized[] = 'containsForeignIdentifier';
         }
diff --git a/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC3103Test.php b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC3103Test.php
new file mode 100644
index 000000000..bb9ccde17
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC3103Test.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\ORM\Mapping\ClassMetadata;
+
+/**
+ * @group DDC-3103
+ */
+class DDC3103Test extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+    /**
+     * @covers \Doctrine\ORM\Mapping\ClassMetadataInfo::__sleep
+     */
+    public function testIssue()
+    {
+        $className     = __NAMESPACE__ . '\\DDC3103ArticleId';
+        $classMetadata = new ClassMetadata($className);
+
+        $this->createAnnotationDriver()->loadMetadataForClass($className, $classMetadata);
+
+        $this->assertTrue(
+            $classMetadata->isEmbeddedClass,
+            'The isEmbeddedClass property should be true from the mapping data.'
+        );
+
+        $this->assertTrue(
+            unserialize(serialize($classMetadata))->isEmbeddedClass,
+            'The isEmbeddedClass property should still be true after serialization and unserialization.'
+        );
+    }
+}
+
+/**
+ * @Embeddable
+ */
+class DDC3103ArticleId
+{
+    /**
+     * @var string
+     * @Column(name="name", type="string", length=255)
+     */
+    protected $nameValue;
+}