diff --git a/AUTHORS b/AUTHORS
index 330256c2..864c95cc 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -126,3 +126,4 @@ that much better:
  * Garry Polley
  * Adrian Scott
  * Peter Teichman
+ * Jakub Kot
diff --git a/mongoengine/fields.py b/mongoengine/fields.py
index 3f413b25..213c2148 100644
--- a/mongoengine/fields.py
+++ b/mongoengine/fields.py
@@ -778,7 +778,7 @@ class ReferenceField(BaseField):
     def to_mongo(self, document):
         if isinstance(document, DBRef):
             if not self.dbref:
-                return DBRef.id
+                return document.id
             return document
         elif not self.dbref and isinstance(document, basestring):
             return document
diff --git a/tests/test_fields.py b/tests/test_fields.py
index fdcc3080..0483519e 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -1105,6 +1105,16 @@ class FieldTest(unittest.TestCase):
         p = Person.objects.get(name="Ross")
         self.assertEqual(p.parent, p1)
 
+    def test_dbref_to_mongo(self):
+        class Person(Document):
+            name = StringField()
+            parent = ReferenceField('self', dbref=False)
+
+        p1 = Person._from_son({'name': "Yakxxx",
+                               'parent': "50a234ea469ac1eda42d347d"})
+        mongoed = p1.to_mongo()
+        self.assertTrue(isinstance(mongoed['parent'], ObjectId))
+
     def test_objectid_reference_fields(self):
 
         class Person(Document):