error on try to show ad related to more than one tid

Using the ad function has the possibility to tell show ad related to one of these tids.
for example $tids = '1,2,3';
now there is a problem in adcache.inc where the related ads got selected in line 221 there is a query:

db_query("SELECT a.aid FROM {ads} a INNER JOIN {term_node} n ON a.aid = n.nid WHERE a.adstatus = 'active' AND n.tid IN(%d)", $id);

the problem here is, that the result with the example above will be:

SELECT a.aid FROM {ads} a INNER JOIN {term_node} n ON a.aid = n.nid WHERE a.adstatus = 'active' AND n.tid IN(1)

the other tids got lost while type-casting
so i changed the %d in the query to %s (i know i will get security issues by doing so....) maybe there is another way ... this should just be some kind of tip

cheers
finfin