drush verify-makefile fails

# drush verify-makefile mymodule/mymodule.make

PHP Fatal error:  Call to undefined function drush_make_ensure_version() in /drush/commands/make/contrib/drush_make_d_o.drush.inc on line 48
PHP Stack trace:
PHP   1. {main}() /drush/drush.php:0
PHP   2. drush_main() /drush/drush.php:14
PHP   3. _drush_bootstrap_and_dispatch() /drush/drush.php:57
PHP   4. drush_dispatch() /drush/drush.php:88
PHP   5. call_user_func_array() /drush/includes/command.inc:225
PHP   6. drush_command() /drush/includes/command.inc:225
PHP   7. _drush_invoke() /drush/includes/command.inc:946
PHP   8. call_user_func_array() /drush/includes/command.inc:125
PHP   9. drush_drush_make_d_o_verify_makefile() /drush/includes/command.inc:125
Drush command terminated abnormally due to an unrecoverable error.                                                                                                                [error]
Error: Call to undefined function drush_make_ensure_version() in /drush/commands/make/contrib/drush_make_d_o.drush.inc, line 48