diff --git a/src/context/service/database/Slice.py b/src/context/service/database/Slice.py
index 717cac9cf17c3d2dccadb90f1b58f81d48302ffa..4c65886abe1a51addbd2309e07c02c21e2329f69 100644
--- a/src/context/service/database/Slice.py
+++ b/src/context/service/database/Slice.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import datetime, logging
+from sqlalchemy import and_
 from sqlalchemy.dialects.postgresql import insert
 from sqlalchemy.engine import Engine
 from sqlalchemy.orm import Session, sessionmaker
@@ -202,20 +203,20 @@ def slice_unset(db_engine : Engine, request : Slice) -> Tuple[Dict, bool]:
     def callback(session : Session) -> bool:
         num_deletes = 0
         num_deletes += session.query(SliceServiceModel)\
-            .filter_by(
+            .filter(and_(
                 SliceServiceModel.slice_uuid == slice_uuid,
                 SliceServiceModel.service_uuid.in_(slice_service_uuids)
-            ).delete()
+            )).delete()
         num_deletes += session.query(SliceSubSliceModel)\
-            .filter_by(
+            .filter_by(and_(
                 SliceSubSliceModel.slice_uuid == slice_uuid,
                 SliceSubSliceModel.subslice_uuid.in_(slice_subslice_uuids)
-            ).delete()
+            )).delete()
         num_deletes += session.query(SliceEndPointModel)\
-            .filter_by(
+            .filter_by(and_(
                 SliceEndPointModel.slice_uuid == slice_uuid,
                 SliceEndPointModel.endpoint_uuid.in_(slice_endpoint_uuids)
-            ).delete()
+            )).delete()
         return num_deletes > 0
 
     updated = run_transaction(sessionmaker(bind=db_engine), callback)