The SpaceX Crew-10 launch attempt was scrubbed Wednesday from Kennedy Space Center meaning two Boeing Starliner astronauts waiting to come home will have to wait some more.

The Crew-10 mission will send four astronauts to the space station to take over for Butch Wilmore and Suni Williams’ crew, finally allowing their return home.

NASA and SpaceX on Wednesday night scrubbed the Falcon 9 launch of a flight intended to retrieve from the International Space Station astronauts Suni Williams and Butch Wilmore, who have spent nine months in orbit.