diff --git a/test/src/helpers/index_timestamp.js b/test/src/helpers/index_timestamp.js
index f1274f6..7f1a24b 100644
--- a/test/src/helpers/index_timestamp.js
+++ b/test/src/helpers/index_timestamp.js
@@ -1,15 +1,10 @@
 import expect from 'expect.js';
 import sinon from 'sinon';
 import moment from 'moment';
-import proxyquire from 'proxyquire';
+import indexTimestamp from '../../../lib/helpers/index_timestamp';
 
 const anchor = '2016-04-02T01:02:03.456'; // saturday
 
-const module = proxyquire.noPreserveCache()('../../../lib/helpers/index_timestamp', {
-  moment: () => moment(anchor)
-});
-const indexTimestamp = module.default;
-
 describe('Index interval', function () {
   describe('indexTimestamp construction', function () {
     it('should throw given an invalid interval', function () {