Cache table doesn't get prefixed.

I run Uniform Server 3.3 which is a little outdated but I face a strange (IMO) PHP bug.
Apache/2.0.55 (Win32) DAV/2 PHP/5.1.1
I defined a prefix for tables: "d_"

db_prefix_tables works fine except for the "cache" table. This query: db_query("SELECT data, created, headers, expire, serialized FROM {$table} WHERE cid = '%s'", $key) doesn't prefix "cache" table which gives an error while executing it.

I made a little patch to correct this behaviour, it works fine for me.

To reproduce it, you can download Uniform Server (which is a standalone, portable AMP), checkout the latest drupal HEAD, install it defining a prefix for your tables.
It will install fine and run an error while displyaing the home page.