ORA-02082: A loop-back db link must have a connection qualifier

I am testing a database link with the target "looped back" into the current database. I get ORA-02082: A loop-back db link must have a connection qualifier.

On Solaris, does anyone know how to correctly qualify the db link to get round this error? Please?

(x-posted to Oracle development)

alter system set global_names=true;