stress --help throws incorrect exit code

[root@gval-cent5-64-n402 test]# ./stress.release --help
Allowed options:

General options:
  --help produce help message
  --version version number

MySQL client:
  --host arg mysql host
  --database arg mysql database
  --user arg mysql user
  --password arg mysql password
  --port arg mysql port
  --socket arg mysql socket
  --mysql_verbose_error explain mysql error codes

Input source:
  --slow_query_log_file arg input slow query log file
  --slow_query_log_socket arg input slow query log socket

[root@gval-cent5-64-n402 test]# echo $?
1
[root@gval-cent5-64-n402 test]#

Exit code in this case should be zero.