diff --git a/tasks/test-task.coffee b/tasks/test-task.coffee
index 69d0fb0ba..857f098f3 100644
--- a/tasks/test-task.coffee
+++ b/tasks/test-task.coffee
@@ -9,6 +9,6 @@ module.exports = (grunt) ->
     commands.push (callback) ->
       spawn cmd: 'pkill', args: ['Atom'], -> callback()
     commands.push (callback) ->
-      atomBinary = path.join(CONTENTS_DIR, 'MacOS', 'Atom')
+      atomBinary = path.join(grunt.config.get('atom.contentsDir'), 'MacOS', 'Atom')
       spawn cmd: atomBinary, args: ['--test', "--resource-path=#{__dirname}"], (error) ->  callback(error)
     grunt.util.async.waterfall commands, (error) -> done(error)