Thread:Project:Support desk/runJobs.php syntax error?

With MW 1.22, I've been seeing this in my error log, I believe since upgrading from PHP 5.3 to PHP 5.4:

PHP Parse error: syntax error, unexpected ':' in ...runJobs.php on line 96

This is line 96:

set_time_limit( $maxTime ?: 0 );

MW 1.22.1, MySQL 5.5.35, PHP 5.4.24 The jobs seem to be running fine.