Fix typo

<a href="https://github.com/marclaporte"><img src="https://avatars.githubusercontent.com/u/1004261?v=2" align="left" width="96" height="96" hspace="10"></img></a> **Issue by [marclaporte](https://github.com/marclaporte)**
_Thursday Sep 04, 2014 at 18:24 GMT_
_Originally opened as https://github.com/oyejorge/less.php/pull/169_

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_**[marclaporte](https://github.com/marclaporte)** included the following code: https://github.com/oyejorge/less.php/pull/169/commits_