For the second time in less than a week, a NASA astronaut reports a small amount of water in his helmet.

It happened as Terry Virts was re-entering the International Space Station after Sunday's third and final leg of a spacewalk. He was not in any danger.

During Wednesday’s 6 hour and 43 minute spacewalk, Virts reported a small amount of free floating water in his helmet.

Water in an astronaut’s helmet is a big concern for NASA. It nearly drowned Italian astronaut Luca Parmitano during a 2013 spacewalk.

However, NASA said the water only formed in Virts’ helmet at the conclusion of the spacewalk as he was re-entering the space station, which is known to happen from time to time.

“This spacesuit is known to have carryover water,” said NASA Spacewalk Officer Alex Kanelakos. “That’s what we call this type of occurrence, and we’ve had seven other occurrences of this carry over on this spacesuit.”

Despite the water issues, NASA said the three spacewalks in eight days have been a success.

During the spacewalk, Virts and Barry “Butch” Wilmore installed new antennas to the outside of the ISS.

The antennas will provide rendezvous and navigational data for new commercial crew vehicles that will be launching from Florida’s Space Coast, starting in 2017.

It was tedious work for astronauts and required a lot of maneuvers for the pair, who also had to lay 400 feet of cable.

The three spacewalks have now set the stage for this summer, when two other NASA astronauts will install a docking port adapter, which will allow SpaceX and Boeing’s crewed spacecraft to connect with the ISS.

NASA said this is the largest transformation of the space station since its construction as the agency gets ready for a new era of commercial crew spaceflight.