How to escape dashes in component parameter names?

After I ran into this problem again I did some further digging in the Freemarker manual and found the answer in the section "Top-level variables": Dashes, dots and colons in parameter names need to be escape using a preceeding slash, e.g. I got my code working by changing it to

<@component id="media.widget.masonry-grid" li\-infinite\-scroll="true" li\-pagination="false"/>