fix space derp from cowboy commit rPc046aa64c16c7c2f956addba06dc7127a9f917be

Summary: yeehaw

Test Plan: also, yeehaw

Reviewers: vrana, epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D4815