diff --git a/toardb/contacts/models_organisation.py b/toardb/contacts/models_organisation.py
index 5370372c219c658ad1e1a759b39a91a6586c8767..31d4dc436a7a824ae5fd0a4149ca6c958e024fdf 100644
--- a/toardb/contacts/models_organisation.py
+++ b/toardb/contacts/models_organisation.py
@@ -3,7 +3,7 @@
 class Organisation (Base)
 =========================
 """
-from sqlalchemy import CheckConstraint, Column, Integer, String, Sequence
+from sqlalchemy import CheckConstraint, Column, Integer, String, Sequence, ForeignKey
 from toardb.base import Base
 
 ORGANISATIONS_ID_SEQ = Sequence('organisations_id_seq')  # define sequence explicitly