diff --git a/src/c3nav/mapdata/models/base.py b/src/c3nav/mapdata/models/base.py
index 50cce74b..e2380dae 100644
--- a/src/c3nav/mapdata/models/base.py
+++ b/src/c3nav/mapdata/models/base.py
@@ -11,6 +11,8 @@ from c3nav.mapdata.models import MapUpdate
 
 
 class SerializableMixin(models.Model):
+    _affected_by_changeset = None
+
     class Meta:
         abstract = True