call to db_next_id fails for rsvp table on postgres

with the following error:

warning: pg_query() [function.pg-query]: Query failed: ERROR: relation "rsvp_seq" does not exist in /path/to/drupal/includes/database.pgsql.inc on line 125.
user warning: query: SELECT nextval('rsvp_seq') in /path/to/drupal/includes/database.pgsql.inc on line 144.

In rsvp_create, it seems that it's being called like:

$rid = db_next_id('rsvp');

but it should be {rsvp}_rid maybe? I just started playing with drupal about 2 hours ago, but the phpdoc comments in include/database.pgsql.inc suggest so:

* Note that the table name should be in curly brackets to preserve compatibility
* with table prefixes. For example, db_next_id('{node}_nid');

I'm not sure if changing this to tablename_seqfield will break mysql, no idea what mysql needs (but I assume this is working in mysql)