creating a view that shows relation name -> OID

This works:

select pg_class.oid, relname from pg_class where relowner=27;

but this:

CREATE VIEW VW_FOO AS select pg_class.oid, relname from pg_class where
relowner=27;

fails with:

Attribute 'oid' has a name conflict
Name matches an existing system attribute

How come?

TIA
Kevin