diff --git a/backup.sh b/backup.sh
index 7141323..64fdd52 100755
--- a/backup.sh
+++ b/backup.sh
@@ -8,6 +8,7 @@ restic_host="${RESTIC_HOST:?RESTIC_HOST not set}"
 
 backup_path="${BACKUP_DEST:?BACKUP_DEST not set}"
 
+# shellcheck disable=SC2153
 ssh_key_file="${SSH_KEY_FILE}"
 s3_key_file="${AWS_SECRET_ACCESS_KEY_FILE}"