exclude not work

[andysongsca]

gulp.task('syncToServer', function() {
return gulp.src(uploadDir)
.pipe(rsync({
root: uploadDir,
username: 'web_server',
hostname: 'yun-s28.zw',
destination: '/data/web_server',
recursive: true,
exclude: [uploadDir + '/build', uploadDir + '/node_modules']
}));
});
,when i run 'gulp syncToServer' ,the directories in ‘exclude’ is still sync to my server.is there something wrong?