diff --git a/src/pretix/control/views/item.py b/src/pretix/control/views/item.py
index 983a73b8a..9d644c2a6 100644
--- a/src/pretix/control/views/item.py
+++ b/src/pretix/control/views/item.py
@@ -271,8 +271,7 @@ class PropertyUpdate(EventPermissionRequiredMixin, UpdateView):
             f.instance.pk = None
 
         for i, f in enumerate(formset.ordered_forms):
-            if f.instance.pk is not None:
-                f.instance = f.instance.clone()
+            f.save(commit=False)
             f.instance.position = i
             f.instance.save()
 
diff --git a/src/tests/control/test_items.py b/src/tests/control/test_items.py
index be2da1642..b767d1ca8 100644
--- a/src/tests/control/test_items.py
+++ b/src/tests/control/test_items.py
@@ -147,7 +147,7 @@ class PropertiesTest(ItemFormTest):
         assert str(PropertyValue.objects.current.get(identity=p2.identity).value) == 'red'
         assert str(PropertyValue.objects.as_of(t1).get(identity=p1.identity).value) == 'S'
         assert not PropertyValue.objects.current.filter(identity=p1.identity).exists()
-        assert Property.objects.as_of(t1).get(identity=c.identity).name == 'Size'
+        assert str(Property.objects.as_of(t1).get(identity=c.identity).name) == 'Size'
 
     def test_delete(self):
         c = Property.objects.create(event=self.event1, name="Size")