diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1a80415486e6686c52f8e85426f1dfe7ff94e82b..8b269ae253af2441f697ddf5d4db7b180ac14430 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -11,7 +11,7 @@ Please follow the house rules to have a bigger chance of your contribution being
  - If you want to modify the CSS, please edit the SCSS files present in `style/`: `main.scss` and others. Don't edit the `main.css`, because it's supposed to be generated.  
  In order to compile your SCSS modifications, you need to use the `sass` gem (install it by running `gem install sass` once Ruby is installed).  
  To run SASS, simply use the following command:  
- `sass --watch style/main.scss`  
+ `sass --unix-newlines --watch style/main.scss`  
  SASS will automatically recompile your css when changed.
  - `Rakefile` contains some tasks that help during development. Feel free to add useful tasks if needed.
  - Please use 2-space indentation when editing the JavaScript. A `.jshintrc` file is present, which will help your code to follow the guidelines if you install and run `jshint`.