Macau’s casino industry took another kick in the nuts on Thursday as mainland China’s biggest province announced new COVID-19 quarantine restrictions.

On Thursday, authorities in Guangdong, China’s most populous province and the closest to Macau, announced a new 14-day quarantine policy for individuals who arrive at its border checkpoints from Macau, Hong Kong or Taiwan. The new rules are intended to minimize further transmission of the COVID-19 coronavirus.

Both Hong Kong and Macau imposed similar rules for their own territories earlier this week after reporting spikes in new COVID-19 cases. Guangdong’s new rules, which take effect Friday at 6am, have reportedly convinced numerous Chinese citizens currently in Macau to head home early to avoid having to spend two weeks in isolation (at their expense).

With nearly one-third of Macau’s 2019 tourist arrivals coming via Guangdong, the new quarantine rules will put further downward pressure on Macau’s already feeble capacity to generate gaming revenue. Most regional airlines have yet to return to anything resembling regular service, making Guangdong’s Gongbei border gate one of the only ways in or out of Macau.