diff --git a/corepos/db/office_op/model.py b/corepos/db/office_op/model.py
index c913ae0..107da66 100644
--- a/corepos/db/office_op/model.py
+++ b/corepos/db/office_op/model.py
@@ -757,6 +757,7 @@ class ProductUser(Base):
         backref=orm.backref(
             'user_info',
             uselist=False,
+            cascade='all, delete-orphan',
             doc="""
             Reference to the :class:`ProductUser` record for this product, if any.
             """))