diff --git a/packages/ddp-client/livedata_connection_tests.js b/packages/ddp-client/livedata_connection_tests.js
index 9c53ba0de3..14e25dd403 100644
--- a/packages/ddp-client/livedata_connection_tests.js
+++ b/packages/ddp-client/livedata_connection_tests.js
@@ -1,3 +1,5 @@
+import lolex from 'lolex';
+
 var newConnection = function (stream, options) {
   // Some of these tests leave outstanding methods with no result yet
   // returned. This should not block us from re-running tests when sources
@@ -96,7 +98,6 @@ Tinytest.add("livedata stub - receive data", function (test) {
 });
 
 Tinytest.add("livedata stub - buffering data", function (test) {
-  var lolex = Npm.require('lolex');
   var stream = new StubStream();
 
   // Install special setTimeout that lets us control it in tests, courtesy of sinon's lolex
diff --git a/packages/ddp-client/package.js b/packages/ddp-client/package.js
index 7a763b4dc4..2e30b6c4cf 100644
--- a/packages/ddp-client/package.js
+++ b/packages/ddp-client/package.js
@@ -49,6 +49,7 @@ Package.onTest(function (api) {
   api.use('mongo', ['client', 'server']);
   api.use('test-helpers', ['client', 'server']);
   api.use([
+    'ecmascript',
     'underscore',
     'tinytest',
     'random',