diff --git a/src/c3nav/editor/models/changeset.py b/src/c3nav/editor/models/changeset.py
index 3a1804be..305910cb 100644
--- a/src/c3nav/editor/models/changeset.py
+++ b/src/c3nav/editor/models/changeset.py
@@ -413,17 +413,13 @@ class ChangeSet(models.Model):
 
     @property
     def updates_cache_key(self):
-        pk, mapupdate = MapUpdate.last_update()
         last_update = self.created if self.last_update_id is None else self.last_update.datetime
-        return (MapUpdate.cache_key() + '_' + int_to_base36(self.last_update_id or 0) + '_' +
-                int_to_base36(int(make_naive(last_update).timestamp())))
+        return (int_to_base36(self.last_update_id or 0)+'_'+int_to_base36(int(make_naive(last_update).timestamp())))
 
     @property
     def changes_cache_key(self):
-        pk, mapupdate = MapUpdate.last_update()
         last_change = self.created if self.last_change_id is None else self.last_change.datetime
-        return (MapUpdate.cache_key() + '_' + int_to_base36(self.last_change_id or 0) + '_' +
-                int_to_base36(int(make_naive(last_change).timestamp())))
+        return (int_to_base36(self.last_change_id or 0)+'_'+int_to_base36(int(make_naive(last_change).timestamp())))
 
     def get_absolute_url(self):
         if self.pk is None: