diff --git a/infra/run-domain-check.sh b/infra/run-domain-check.sh
index 74d6122..329209e 100755
--- a/infra/run-domain-check.sh
+++ b/infra/run-domain-check.sh
@@ -142,8 +142,10 @@ done
 [ -n "$task_id2" ] || { echo "FAIL — no Beoordelen task appeared for registration $reg_id2" >&2; docker logs "$dom" 2>&1 | tail -15 >&2; exit 1; }
 echo ">> Beoordelen task $task_id2 is waiting; withdrawing the registration via the domain"
 
+# Owner-scoped: the withdraw carries the same bsn the registration was submitted with (S-11c).
 docker run --rm --network "$net" curlimages/curl:latest \
-  -fsS -X POST "http://$dom_ip:8080/registrations/$reg_id2/withdraw" >/dev/null
+  -fsS -X POST "http://$dom_ip:8080/registrations/$reg_id2/withdraw" \
+  -H 'Content-Type: application/json' -d '{"bsn":"123456782"}' >/dev/null
 
 echo ">> asserting the process was cancelled (no Beoordelen task remains for the registration)"
 gone=""