diff --git a/zesje/api/exams.py b/zesje/api/exams.py
index 83dc5347614650a3fa830b4149051ea85976fd31..706e7413cfadccc715fec6a7006482f0cc43d500 100644
--- a/zesje/api/exams.py
+++ b/zesje/api/exams.py
@@ -287,6 +287,7 @@ class ExamSource(Resource):
 
         return send_file(
             os.path.join(exam_dir, 'exam.pdf'),
+            cache_timeout=0,
             mimetype='application/pdf')