Thousands of workers have gone on strike at a Vietnamese plant that makes shoes for Nike, demanding higher pay.

Workers who produce about 10% of the 75 million pairs of shoes made for Nike in Vietnam annually want more pay, bonuses, and cost of living allowances.

Strikes have become more common in Vietnam, as inflation—now at 9.5 percent—has risen. The average monthly salary at the South Korean-owned plant is $62, about 20% more than the minimum wage.

The plant in Dong Nai, near Ho Chi Minh City, employs some 14,000 people.

Nike is aware of the strike and is encouraging workers and management to resolve their differences, said a spokesman for Nike U.K. It is not clear how long the strike will continue for.