diff --git a/tiramisu/option.py b/tiramisu/option.py
index 20b1c43..ec231c9 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -30,7 +30,7 @@ import warnings
 
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy import create_engine, Column, Integer, String, Boolean, \
-    PickleType, ForeignKey, Table, and_
+    PickleType, ForeignKey, Table
 from sqlalchemy.orm import relationship, backref
 from sqlalchemy.orm import sessionmaker