diff --git a/roles/queue/files/wipe-mailbox.sh b/roles/queue/files/wipe-mailbox.sh
index b12b0934aa35cd982ccd25856f1fad56d5a53fe1..07e95cc3030fa8b5a1390e7cfe5a5c213a839a89 100644
--- a/roles/queue/files/wipe-mailbox.sh
+++ b/roles/queue/files/wipe-mailbox.sh
@@ -28,6 +28,11 @@ if [ -z "${mailbox}" ]; then
     exit 2
 fi
 
+if [ $confirm -ne 1 ]; then
+    echo "You did not pass the confirmation option --yes-i-am-sure!" >&2
+    exit 1
+fi
+
 set -euo pipefail
 
 # Get the list of mailboxes in an array.