diff --git a/swh/model/model.py b/swh/model/model.py
--- a/swh/model/model.py
+++ b/swh/model/model.py
@@ -127,6 +127,7 @@
         ov = super().to_dict()
         if ov['visit'] is None:
             del ov['visit']
+        ov['origin'] = self.origin.to_dict()
         return ov
 
     @classmethod
diff --git a/swh/model/tests/test_model.py b/swh/model/tests/test_model.py
--- a/swh/model/tests/test_model.py
+++ b/swh/model/tests/test_model.py
@@ -8,14 +8,14 @@
 from hypothesis import given
 
 from swh.model.model import Content
-from swh.model.hypothesis_strategies import objects, origins
+from swh.model.hypothesis_strategies import objects, origins, origin_visits
 
 
 @given(objects())
 def test_todict_inverse_fromdict(objtype_and_obj):
     (obj_type, obj) = objtype_and_obj
 
-    if obj_type == 'origin':
+    if obj_type in ('origin', 'origin_visit'):
         return
 
     obj_as_dict = obj.to_dict()
@@ -39,6 +39,15 @@
     assert type(origin)(url=origin.url) == type(origin).from_dict(obj)
 
 
+@given(origin_visits())
+def test_todict_origin_visits(origin_visit):
+    obj = origin_visit.to_dict()
+
+    assert 'type' not in obj['origin']
+    origin_visit.origin.type = None
+    assert origin_visit == type(origin_visit).from_dict(obj)
+
+
 def test_content_get_hash():
     hashes = dict(
         sha1=b'foo', sha1_git=b'bar', sha256=b'baz', blake2s256=b'qux')