diff --git a/oslo_db/sqlalchemy/models.py b/oslo_db/sqlalchemy/models.py
index 2bad0f570fba0107e5659c9f1453cbec4716ac41..72ac7cba9845bd80e08bae62880e85979a255506 100644
--- a/oslo_db/sqlalchemy/models.py
+++ b/oslo_db/sqlalchemy/models.py
@@ -34,18 +34,8 @@ class ModelBase(object):
 
     def save(self, session):
         """Save this object."""
-
-        # NOTE(boris-42): This part of code should be look like:
-        #                       session.add(self)
-        #                       session.flush()
-        #                 But there is a bug in sqlalchemy and eventlet that
-        #                 raises NoneType exception if there is no running
-        #                 transaction and rollback is called. As long as
-        #                 sqlalchemy has this bug we have to create transaction
-        #                 explicitly.
-        with session.begin(subtransactions=True):
-            session.add(self)
-            session.flush()
+        session.add(self)
+        session.flush()
 
     def __setitem__(self, key, value):
         setattr(self, key, value)
diff --git a/oslo_db/tests/fixtures.py b/oslo_db/tests/fixtures.py
index acc260d003b70026c080e76a930ea469d648a774..46462782d43752742e093d67d97e316e7a14d1d4 100644
--- a/oslo_db/tests/fixtures.py
+++ b/oslo_db/tests/fixtures.py
@@ -45,11 +45,6 @@ class WarningsFixture(fixtures.Fixture):
             message=r'The Session.autocommit parameter is deprecated .*',
             category=sqla_exc.SADeprecationWarning)
 
-        warnings.filterwarnings(
-            'once',
-            message=r'The Session.begin.subtransactions flag is deprecated .*',
-            category=sqla_exc.SADeprecationWarning)
-
         warnings.filterwarnings(
             'once',
             message=r'Calling \.begin\(\) when a transaction is already .*',