Node not starting on Ubuntu 14.04 LTS

[SirePi]

On a new Ubuntu server I get the following error when trying to start Tilestream

/tilestream/node_modules/connect/node_modules/qs/lib/index.js:5
const Stringify = require('./stringify');
^^^^^
SyntaxError: Use of const in strict mode.
at Module._compile (module.js:439:25)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object. (/root/tilestream/node_modules/connect/lib/middleware/bodyParser.js:13:10)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)

using Node 0.10.28;
on another machine with the same Node version, it works without issues.

What might be wrong?

Thanks

[SirePi]

Starting node with option --harmony solves the issue, but is it normal?