NASA said Monday it has successfully made repairs to the space shuttle Endeavour, clearing the way for a Wednesday morning launch.

Plans for Canadian astronaut Julie Payette and six other astronauts to take off to the International Space Station on Saturday were postponed when a potentially hazardous hydrogen leak was found in the fuel tank.

The leak was discovered while the shuttle was being fuelled at Cape Canaveral, Fla., late Friday.

This leak was similar to one the space agency faced in March during the launch countdown for space shuttle Discovery. Discovery was able to have a successful launch on a second attempt.

NASA said Monday the repairs to a hydrogen gas vent line connected to the shuttle Endeavour's fuel tank were successful.

The new launch date means the Atlas V rocket launch, set to take on an unmanned moon mission, will have to take a backseat until Thursday at the earliest. The rocket was originally set to launch the Lunar Reconnaissance Orbiter and Lunar Crater Observation and Sensing Satellite to the moon on Wednesday afternoon.

Endeavour's crew will complete the Japan's Kibo space station lab, adding two porches and a robotic arm.

Endeavour's attempt to launch will be at 5:40 a.m. ET.

Payette was the first Canadian to visit the space station in 1999. In the coming mission, she will join Canada's Robert Thirsk, who is already aboard. Thirsk has completed one month of a six-month stay on the space station, marking the first time a Canadian has participated in a long-duration space flight.

This would be the first time two Canadians have been in space at once.