"Viva voce" exams are used in many disciplines as a test of students' knowledge and skills. Whilst acknowledged as a useful form of assessment, vivas commonly lead to a great deal of anxiety for students. This anxiety is also apparent for vivas in phonetics, where the students must produce and recognise sounds drawn from across the world's languages, and previous work has shown that viewing a video of a mock-viva does not reduce this anxiety. To address anxiety prior to phonetics vivas, 63 students, across 3 cohorts, engaged in a brief, isolated, peer-mentoring session with previously successful students ("viva survivors"). Anxiety about the viva was measured before and after the mentoring experience, using the short form of the State-Trait Anxiety Inventory. There was a significant reduction in anxiety after mentoring, and a significant correlation between anxiety before mentoring and the decrease in anxiety after mentoring. Short-term mentoring is posited as a time- and cost-effective method to decrease viva-related anxiety across disciplines.