In case you missed the news, SpaceX’s launch attempt for a rendezvous with the International Space Station had to be scrapped just before lift off on Saturday.

According to a press release from the company, the launch “was aborted when the flight computer detected slightly high pressure in the Engine 5 combustion chamber. We have discovered root cause and repairs are underway.”

During inspection after the launch was cancelled, engineers discovered a faulty check valve on the engine which was the cause of the pressure anomaly. The valve has been replaced and the rocket is officially “go” to launch Tuesday, May 22 at 3:44 AM EDT.