diff --git a/packages/ecmascript/package.js b/packages/ecmascript/package.js
index eed53fefd0..37378b5163 100644
--- a/packages/ecmascript/package.js
+++ b/packages/ecmascript/package.js
@@ -31,7 +31,7 @@ Package.onUse(function(api) {
 });
 
 Package.onTest(function(api) {
-  api.use(['tinytest', 'underscore']);
+  api.use(['tinytest']);
   api.use(['es5-shim', 'ecmascript', 'babel-compiler']);
   api.addFiles('runtime-tests.js');
   api.addFiles('transpilation-tests.js', 'server');
diff --git a/packages/ecmascript/runtime-tests.js b/packages/ecmascript/runtime-tests.js
index f0cb308a97..c4ddfe227d 100644
--- a/packages/ecmascript/runtime-tests.js
+++ b/packages/ecmascript/runtime-tests.js
@@ -216,7 +216,7 @@ Tinytest.add('ecmascript - runtime - block scope', test => {
       });
     }
 
-    _.each(thunks, f => f());
+    thunks.forEach(f => f());
     test.equal(buf, [0, 1, 2]);
   }
 });