diff --git a/src/c3nav/editor/models/changeset.py b/src/c3nav/editor/models/changeset.py
index 75dd8ac2..25f251a6 100644
--- a/src/c3nav/editor/models/changeset.py
+++ b/src/c3nav/editor/models/changeset.py
@@ -344,7 +344,7 @@ class ChangeSet(models.Model):
                 # todo: fix this
                 continue
             objects.setdefault(LocationSlug, {})[target.pk] = target
-            objects.setdefault(target.__class__, {})[target.pk] = target
+            objects.setdefault(target._obj.__class__, {})[target.pk] = target
 
         return objects