diff --git a/moz.build b/moz.build
index b1f244977ff..bc872498912 100644
--- a/moz.build
+++ b/moz.build
@@ -1,4 +1,3 @@
-DEFINES['FOO'] = '1'
 # -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
 # vim: set filetype=python:
 # This Source Code Form is subject to the terms of the Mozilla Public