Psy's Gangnam Style video has forced YouTube.com boffins to upgrade their views counter to keep up with the demand for the quirky 2012 promo.

The South Korean hitmaker's video remains the most-watched on YouTube, with over 2,155,653,000 views - more than the site's counter could previously cope with.

A YouTube spokesman says, "We never thought a video would be watched in numbers greater than a 32-bit integer (2,147,483,647 views) but that was before we met Psy."

As a result, the boffins had to upgrade its system, so it could continue to track Psy's video success.