Facebook representatives in recent weeks have been meeting with mobile gaming companies, a key group of advertisers, ahead of a major change by Apple that will make it harder for apps to track the behavior of iPhone owners.

In the talks, Facebook employees have sought to hear gaming companies’ concerns about Apple’s next mobile operating system, which is expected to reduce the effectiveness of Facebook’s powerful ad targeting tool in reaching customers, according to two people familiar with the matter. The discussions give a window into the seismic changes Apple, touting the privacy benefits of such limits, is forcing on advertising-driven tech companies including Google, Snap and Twitter.