Amazon.com Inc. founder Jeff Bezos’s space startup Blue Origin LLC has won a contract to supply engines for United Launch Alliance LLC, the Wall Street Journal reported on Thursday.

ULA, the rocket joint venture of Boeing Co (BA.N) and Lockheed Martin Corp (LMT.N), is set to announce on Thursday that it has picked Blue Origin’s BE-4 engine for its Vulcan rocket, the WSJ reported, citing people familiar with the matter

United Launch Alliance and Blue Origin were not immediately available for comment outside regular business hours.