diff --git a/anki/models.py b/anki/models.py
index afd14fff8..758e679e0 100644
--- a/anki/models.py
+++ b/anki/models.py
@@ -63,6 +63,7 @@ class FieldModel(object):
         for p in class_mapper(FieldModel).iterate_properties:
             setattr(new, p.key, getattr(self, p.key))
         new.id = genID()
+        new.model = None
         return new
 
 mapper(FieldModel, fieldModelsTable)
@@ -120,6 +121,7 @@ class CardModel(object):
         for p in class_mapper(CardModel).iterate_properties:
             setattr(new, p.key, getattr(self, p.key))
         new.id = genID()
+        new.model = None
         return new
 
 mapper(CardModel, cardModelsTable)
diff --git a/tests/test_deck.py b/tests/test_deck.py
index 9b714924b..1a1ccaa3c 100644
--- a/tests/test_deck.py
+++ b/tests/test_deck.py
@@ -138,6 +138,8 @@ def test_modelAddDelete():
 def test_modelCopy():
     deck = DeckStorage.Deck()
     m = JapaneseModel()
+    assert len(m.fieldModels) == 3
+    assert len(m.cardModels) == 2
     deck.addModel(m)
     f = deck.newFact()
     f['Expression'] = u'1'
@@ -147,6 +149,11 @@ def test_modelCopy():
     assert m2.id != m.id
     assert m2.fieldModels[0].id != m.fieldModels[0].id
     assert m2.cardModels[0].id != m.cardModels[0].id
+    assert len(m2.fieldModels) == 3
+    assert len(m.fieldModels) == 3
+    assert len(m2.fieldModels) == len(m.fieldModels)
+    assert len(m.cardModels) == 2
+    assert len(m2.cardModels) == 2
 
 def test_media():
     deck = DeckStorage.Deck()