diff --git a/config/build.js b/config/build.js
index 1cc7d94..6849ce2 100644
--- a/config/build.js
+++ b/config/build.js
@@ -29,7 +29,7 @@ rollup.rollup({
   entry: 'src/index.js',
   plugins: [
     babel({
-      presets: ['es2015-rollup']
+      presets: ['es2015-loose-rollup']
     })
   ]
 })
@@ -48,7 +48,7 @@ rollup.rollup({
         'process.env.NODE_ENV': "'development'"
       }),
       babel({
-        presets: ['es2015-rollup']
+        presets: ['es2015-loose-rollup']
       })
     ]
   })
@@ -69,7 +69,7 @@ rollup.rollup({
         'process.env.NODE_ENV': "'production'"
       }),
       babel({
-        presets: ['es2015-rollup']
+        presets: ['es2015-loose-rollup']
       })
     ]
   })
diff --git a/config/karma.conf.js b/config/karma.conf.js
index b61d192..38d27eb 100644
--- a/config/karma.conf.js
+++ b/config/karma.conf.js
@@ -36,7 +36,7 @@ module.exports = function (config) {
           exclude: /node_modules|vue\/dist/,
           loader: 'babel',
           query: {
-            presets: ['es2015'],
+            presets: ['es2015-loose'],
             plugins: [
               'babel-plugin-espower'
               // NOTE: disable, see https://github.com/speedskater/babel-plugin-rewire#istanbul
diff --git a/config/webpack.dev.conf.js b/config/webpack.dev.conf.js
index d9b990e..6753e80 100644
--- a/config/webpack.dev.conf.js
+++ b/config/webpack.dev.conf.js
@@ -19,7 +19,7 @@ module.exports = {
       exclude: /node_modules|vue\/dist/,
       loader: 'babel',
       query: {
-        presets: ['es2015']
+        presets: ['es2015-loose']
       }
     }]
   },
diff --git a/config/webpack.e2e.conf.js b/config/webpack.e2e.conf.js
index 3022f5d..fedb2cf 100644
--- a/config/webpack.e2e.conf.js
+++ b/config/webpack.e2e.conf.js
@@ -12,7 +12,7 @@ module.exports = {
       exclude: /node_modules|vue\/dist/,
       loader: 'babel',
       query: {
-        presets: ['es2015']
+        presets: ['es2015-loose']
       }
     }]
   },
diff --git a/config/webpack.test.conf.js b/config/webpack.test.conf.js
index 8c32d25..ab16422 100644
--- a/config/webpack.test.conf.js
+++ b/config/webpack.test.conf.js
@@ -22,7 +22,7 @@ module.exports = {
       exclude: /node_modules|vue\/dist/,
       loader: 'babel',
       query: {
-        presets: ['es2015'],
+        presets: ['es2015-loose'],
         plugins: [
           'babel-plugin-espower',
           'babel-plugin-rewire'
diff --git a/package.json b/package.json
index 0d233d5..fd34b60 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,8 @@
     "babel-plugin-transform-es2015-modules-commonjs": "^6.7.0",
     "babel-polyfill": "^6.5.0",
     "babel-preset-es2015": "^6.5.0",
-    "babel-preset-es2015-rollup": "^1.0.0",
+    "babel-preset-es2015-loose": "^7.0.0",
+    "babel-preset-es2015-loose-rollup": "git+https://github.com/kazupon/babel-preset-es2015-loose-rollup.git#master",
     "cz-conventional-changelog": "^1.1.4",
     "eslint": "^2.3.0",
     "eslint-config-standard": "^5.1.0",