dbprefix on multiple join conditions

[eluser]Unknown[/eluser]
I have dbprefix set to TEST_ and a join statement on the form:
$this->db->join('table', 'cond1 AND cond2', 'left');

It is only the table names in cond1 that gets prefixed with the dbprefix.

Is there an alternative CI way of specifying multiple conditions on a join that is easier for CI to parse?