Fix nonstandard specification of a constant

Summary: See https://github.com/phacility/phabricator/commit/648fa2e1bcc68011c7ad53bba185ed58c4b0f67f#commitcomment-10724671.

Test Plan: peered deep into its soul

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D12415