Psy's Gangnam Style video has forced 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.