diff --git a/pyalchemybiz/model/__init__.py b/pyalchemybiz/model/__init__.py
index 7b12f5b..1f7b6b7 100644
--- a/pyalchemybiz/model/__init__.py
+++ b/pyalchemybiz/model/__init__.py
@@ -12,7 +12,7 @@ log = logging.getLogger(__name__)
 def init_model(engine):
     """Call me before using any of the tables or classes in the model."""
 
-    sm = orm.sessionmaker(autoflush=True, transactional=True, bind=engine)
+    sm = orm.sessionmaker(autoflush=True, autocommit=False, bind=engine)
 
     meta.engine = engine
     meta.Session = orm.scoped_session(sm)