LONDON (AP) ― North Korea’s IOC member wants Olympic organizers to take steps to ensure there are no more mix-ups of national flags ― especially at the medal ceremonies.

Chang Ung expressed his disappointment Thursday after the South Korean flag was mistakenly displayed on the giant screen before the women’s soccer game between North Korea and Colombia in Glasgow, Scotland, on Wednesday night.

The North Koreans refused to take the field for about an hour before the match went ahead. London organizers apologized.

“This should not have happened,” Chang told the Associated Press.

“I am really surprised how ... the London Olympic team, the protocol people, didn’t invite someone from the team to check if it is your flag.”

Chang proposed that Olympic protocol officials meet with team leaders before each medal ceremony to check that the correct flags and anthems are being used.

“With 302 medal awarding ceremonies, if something bad happened, that’s damaging for the IOC,” he said. “Beforehand, the protocol people should invite the team leader or captain to come up.”

Asked whether he was satisfied with the apology from London organizers, Chang said, “They apologized to the national team, that’s enough.”

Earlier, speaking during the final session of the International Olympic Committee’s general assembly, Chang said the flag incident wasn’t “a big political issue” but that further mix-ups could have “negative political consequences” for the Olympic movement.

IOC president Jacques Rogge responded that organizers had moved to fix the problem.