Human trafficking thrives in crises contexts. Humanitarian crisis such as Typhoon Haiyan in the Philippines in 2013/14 and the 2015 earthquake in Nepal demonstrated how trafficking trends can quickly emerge and increase in the days following devastation. Yet humanitarian responses often overlook victims of human trafficking as a beneficiary group and fail to effectively integrate counter-trafficking measures. This paper summaries lessons learnt from previous humanitarian crises that are applicable to anti-slavery work, and can help inform programming in light of the coronavirus pandemic.