(The insulting PowerPoint slide)

Chinese students at the Australian National University (ANU) raised their dissatisfaction after a computer science professor displayed an insulting PowerPoint slide that said: “I will not tolerate students who cheat” in Chinese, according to the Global Times on Monday.

The warning was thought to be targeted at Chinese students, who reported the issue to the Dean’s Office and complained on ANU’s official Facebook page after class.

The professor offered an apology via email, saying he did not realize it was offensive and said it was just for those whose first language is not English. “Since a very large fraction of the class has Chinese as their first language, I thought it would help the class understand the point by printing it in Chinese as well as English,” he said. “It was a poor decision.”

The incident is not the first racist incident at Australian universities. The words “kill Chinese” were inscribed above a swastika sign in restrooms at the University of Sydney on Aug. 2, and a few weeks ago anti-Chinese posters were plastered on building signs and walls at two Melbourne universities, forbidding them from entering.

More than a quarter of international students in Australia come from China. The country is also home to a large Australian-Chinese community. The 2016 Census of Population and Housing revealed that 5.6% of Australian population is Chinese by ancestry.