OPEC and Azerbaijan are in talks about the former Soviet republic joining the group, as the cartel looks to bolster its position amid a surge in U.S. shale oil.

An agreement with 10 non-OPEC members, including Azerbaijan, that has cut production and boosted oil price ends this year, and some cartel officials are concerned it won’t be extended.

That has left the Organization of the Petroleum Exporting Countries looking for ways to broaden its reach in more formal ways, analysts say.

OPEC already has added two members in recent years, bringing its membership to 14. Now, it is holding talks with Azerbaijan about the country entering the organization as a full member, an OPEC official said.

With new oil flowing out of the U.S., Canada and Russia, OPEC’s share of the oil market has fallen to 40% from 55% in the early 1970s, undermining its ability to move prices as it once did.