Ember Fastboot Jquery

I just added ember-cli-fastboot (github) on my project in order to have a pre-render server for crawlers bots.

After following installation steps, I get an error message when starting the server (ember fastboot --serve-assets):

jQuery is not defined
ReferenceError: jQuery is not defined
at <anonymous>:66304:16 [...]

Is there something in the cache to clean? Am I missing something obvious?