diff --git a/src/pretix/base/services/checkin.py b/src/pretix/base/services/checkin.py
index aff452b1ae..d3e411a77d 100644
--- a/src/pretix/base/services/checkin.py
+++ b/src/pretix/base/services/checkin.py
@@ -99,7 +99,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
     answers = {a.question: a for a in op.answers.all()}
     require_answers = []
     for q in op.item.checkin_questions:
-        if q not in given_answers:
+        if q not in given_answers and q not in answers:
             require_answers.append(q)
 
     _save_answers(op, answers, given_answers)