Astronauts on the International Space Station will head out for another spacewalk this weekend despite a water leak in one astronaut's helmet Wednesday.

NASA on Friday cleared astronaut Terry Virts' spacesuit for Sunday's spacewalk, the last of three to route hundreds of feet of cable needed for the new, American-made spacecraft set to fly to the space station starting in 2017.

At the end of  Wednesday's spacewalk with fellow astronaut Butch Wilmore, a small amount of water leaked into Virts' helmet.

NASA said Virts was never in any danger Wednesday, but engineers spent two days investigating the leak. Another astronaut almost drowned in 2013 when his helmet flooded during a spacewalk.

NASA said it now believes it understands the quirks with Virts' spacesuit and helmet, and that they are safe to use on Sunday.