JAKARTA (AFP) — Indonesia is cracking down on a viral pirate flag that is spreading as a symbol of political protest ahead of independence day.

The Jolly Roger skull and bones with a straw hat — from Japanese anime series “One Piece” — has been fluttering from a rising number of trucks, cars and homes.

Officials warn the “provocation” — seen by many as a protest against President Prabowo Subianto’s policies — should not fly alongside the country’s red-and-white flag.

The pirate banner was taken up by disgruntled truck drivers earlier this summer, but has recently snowballed into an online and real-life movement.

“I personally raised the One Piece flag because the red and white flag is too sacred to be raised in this corrupt country,” Khariq Anhar, a 24-year-old university student in Sumatra’s Riau province, told Agence France-Presse.

“I believe freedom of speech in Indonesia exists, but it is very limited. Voicing your opinion is getting more dangerous.”

Government officials say the flag’s use is an attempt to divide the nation.

They warn it may be banned from flying next to Indonesia’s colors, or being raised on 17 August — the 80th independence anniversary after Japan’s surrender at the end of World War II.

“It is imperative we refrain from creating provocation with symbols that are not relevant to this country’s struggle,” chief security minister Budi Gunawan said in a statement last week.

Ministers have cited a law that prohibits flying a symbol higher than the national flag as the basis for any punishment.

Under that law, intent to desecrate, insult or degrade the flag carries a maximum prison sentence of five years or a fine of nearly $31,000.

State Secretary Minister Prasetyo Hadi on Tuesday said Prabowo had no issue with the “expression of creativity,” but the two flags “should not be placed side by side in a way that invites comparison,” local media reported.