diff --git a/unfold/brightway25_export.py b/unfold/brightway25_export.py
index c7a2230..395df1d 100644
--- a/unfold/brightway25_export.py
+++ b/unfold/brightway25_export.py
@@ -3,6 +3,7 @@
 
 from bw2data import Database, databases
 from bw2io.importers.base_lci import LCIImporter
+from wurst.linking import change_db_name, check_internal_linking, link_internal
 
 
 class BW25UnfoldExporter(LCIImporter):