diff --git a/app/orm.py b/app/orm.py
index d3c795e..a6e5974 100644
--- a/app/orm.py
+++ b/app/orm.py
@@ -62,7 +62,7 @@ class Origin(Base):
         if origin_refs is None:
             deletions = session.query(Origin).delete()
         else:
-            deletions = session.query(Origin).filter(Origin.origin_ref in origin_refs).delete()
+            deletions = session.query(Origin).filter(Origin.origin_ref.in_(origin_refs)).delete()
         session.commit()
         session.close()
         return deletions