diff --git a/.babelrc b/.babelrc
index cd4b084e..55c6642f 100644
--- a/.babelrc
+++ b/.babelrc
@@ -3,6 +3,7 @@
     [
       "env",
       {
+        "loose": true,
         "targets": {
           "node": "8"
         }
diff --git a/rollup.config.js b/rollup.config.js
index 2080f75b..d630a7bc 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -54,7 +54,7 @@ export default {
     babel({
       exclude: 'node_modules/**',
       babelrc: false,
-      presets: [['env', { modules: false }], 'stage-2'],
+      presets: [['env', { loose: true, modules: false }], 'stage-2'],
       plugins: ['external-helpers']
     }),
     umd