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Current research on the in-class discursive realities in English as a Medium of Instruction (EMI) classrooms has been mostly restricted to whole class scenarios, whereas student-student interactive discourse in task-based activities is largely ignored. This study explores peer interactions among university students in an EMI marketing course in China, specifically focusing on repair practices. The data mainly comprised transcribed recordings of 26 peer interactions during two types of tasks, i.e. topic discussions and simulations. Findings reveal that the task type plays an important role in how various trouble sources are addressed. In both task types, there is a dominance of factual repairables, which are addressed through various collaboratively constructed repair trajectories. However, the relatively informal yet concept-related topic discussions elicit more frequent repair in general and linguistic-form related repair in particular than the relatively formal but hands-on natured simulations, though the latter type of task leads to more procedural and processing-related repairs. Implications are discussed regarding the importance of raising teachers' awareness that different activities hold different language and content learning opportunities in peer interactions in EMI classes. [ABSTRACT FROM AUTHOR]