Cannot run glance-manage db_sync with PostgreSQL

After configuring PostgreSQL and both glance api and glance registry to use postgresql, I run:
sudo -u glance glance-manage db_sync

I get the following error:

sudo -u glance glance-manage db_sync
Traceback (most recent call last):
  File "/usr/bin/glance-manage", line 126, in <module>
    main()
  File "/usr/bin/glance-manage", line 122, in main
    dispatch_cmd(args)
  File "/usr/bin/glance-manage", line 98, in dispatch_cmd
    cmd_func(args)
  File "/usr/bin/glance-manage", line 86, in do_db_sync
    glance.db.sqlalchemy.migration.db_sync(version, current_version)
  File "/usr/lib/python2.6/site-packages/glance/db/sqlalchemy/migration.py", line 127, in db_sync
    upgrade(version=version)
  File "/usr/lib/python2.6/site-packages/glance/db/sqlalchemy/migration.py", line 67, in upgrade
    return versioning_api.upgrade(sql_connection, repo_path, version)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/api.py", line 185, in upgrade
    return _migrate(url, repository, version, upgrade=True, err=err, **opts)
  File "<string>", line 2, in _migrate
  File "/usr/lib/python2.6/site-packages/migrate/versioning/util/__init__.py", line 160, in with_engine
    return f(*a, **kw)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/api.py", line 364, in _migrate
    schema.runchange(ver, change, changeset.step)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/schema.py", line 90, in runchange
    change.run(self.engine, step)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/script/py.py", line 145, in run
    script_func(engine)
  File "/usr/lib/python2.6/site-packages/glance/db/sqlalchemy/migrate_repo/versions/006_key_to_name.py", line 75, in upgrade
    index.rename('ix_image_properties_image_id_name')
  File "/usr/lib/python2.6/site-packages/migrate/changeset/schema.py", line 620, in rename
    engine._run_visitor(visitorcallable, self, connection, **kwargs)
  File "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 2303, in _run_visitor
    conn._run_visitor(visitorcallable, element, **kwargs)
  File "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1973, in _run_visitor
    **kwargs).traverse_single(element)
  File "/usr/lib/python2.6/site-packages/migrate/changeset/ansisql.py", line 55, in traverse_single
    ret = super(AlterTableVisitor, self).traverse_single(elem)
  File "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/sql/visitors.py", line 106, in traverse_single
    return meth(obj, **kw)
  File "/usr/lib/python2.6/site-packages/migrate/changeset/ansisql.py", line 172, in visit_index
    (self.preparer.quote(self._validate_identifier(index.name,
AttributeError: 'PGSchemaChanger' object has no attribute '_validate_identifier'

I am running Scientific Linux 6.3 using postgresql-8.4.13-1.el6_3.x86_64 and openstack-glance from the EPEL rpm packaging ( openstack-glance-2012.2-3.el6.noarch, python-glance-2012.2-3.el6.noarch, python-glanceclient-0.5.1-1.el6.noarch)