wp_w3tc_cdn_queue has VARCHAR(150) for local_path & remote_path

The wp_w3tc_cdn_upload_queue table is created with varchar(150) for both load_path and remote_path, but this is causing us problems as the local path is over 150 chars, for example:

local_path:
/var/www/vhosts/www/html/wp-content/uploads/2011/05/Injured-Chinese-men-and-women-are-seen-in-the-aftermath-of-a-scuffle-at-Apples-Sanlitun-retail-sto

remote_path:
wp-content/uploads/2011/05/Injured-Chinese-men-and-women-are-seen-in-the-aftermath-of-a-scuffle-at-Apples-Sanlitun-retail-store-in-Beijing-China.jpg

I.e. local_path has reached the 150 char limit. I am going to modify our table to use ~400, is the 150 limit really necessary?