Apple iOS sales will be topped by Alibaba’s YunOS in what was once the U.S. tech behemoth’s growth engine.

YunOS is set to take 14% of the smartphone shipments in mainland China (which doesn’t include areas such as Macau and Hong Kong) by the end of 2016—surpassing Apple’s iOS as China’s second-biggest smartphone operating system, according to analysts as cited by the South China Morning Post.

Research firm Strategy Analytics estimates that YunOS will be installed on over 100 million iPhones shipped in mainland China this year.

While Apple aapl sales grew explosively in China last year, iPhone sales to the region have recently turned negative, contributing to the U.S. company’s third straight quarter of sales declines on a year-over-year basis.

 

Still, Apple expects iPhone sales in China to pick up in the December quarter, according to The Verge.

Alibaba baba , which hopes to make YunOS the software of choice for Chinese consumers, still has another, far larger hurdle to climb. The vast majority of smartphone users in China use the Google Android, according to data gathered by the South China Morning Post.