diff --git a/app/orm.py b/app/orm.py
index 31fa64c..26b869a 100644
--- a/app/orm.py
+++ b/app/orm.py
@@ -101,7 +101,7 @@ class Lease(Base):
     @staticmethod
     def cleanup(engine: Engine, origin_ref: str) -> int:
         session = sessionmaker(autocommit=True, autoflush=True, bind=engine)()
-        deletions = session.query(Lease).delete(Lease.origin_ref == origin_ref)
+        deletions = session.query(Lease).filter(Lease.origin_ref == origin_ref).delete()
         session.close()
         return deletions