SpaceX’s mission, which aimed to clear the path for two astronauts stranded in space to return to Earth, has been rescheduled.

The launch from Florida’s Cape Canaveral Space Force Station was postponed due to a hydraulic ground issue. Another launch opportunity is available on Thursday.

The rocket intended to transport four new crew members to the International Space Station (ISS) and facilitate the return of Suni Williams and Butch Wilmore.

NASA astronauts Williams and Wilmore traveled to space in June but were unable to return on a Boeing spacecraft due to safety concerns. They would have been able to return to Earth within days of the SpaceX mission arriving at the ISS.