diff --git a/lib/Resque/Worker.php b/lib/Resque/Worker.php
index 6c72a36..973d7fd 100644
--- a/lib/Resque/Worker.php
+++ b/lib/Resque/Worker.php
@@ -327,7 +327,7 @@ class Resque_Worker
 	private function updateProcLine($status)
 	{
 		$processTitle = 'resque-' . Resque::VERSION . ': ' . $status;
-		if(function_exists('cli_set_process_title')) {
+		if(function_exists('cli_set_process_title') && PHP_OS !== 'Darwin') {
 			cli_set_process_title($processTitle);
 		}
 		else if(function_exists('setproctitle')) {