diff --git a/dist b/dist
index dcf62124363cabd3665a2487b8cf18b23c655ba3..acfce069121920c349b2678b2e1b6d0f1a62b45b 160000
--- a/dist
+++ b/dist
@@ -1 +1 @@
-Subproject commit dcf62124363cabd3665a2487b8cf18b23c655ba3
+Subproject commit acfce069121920c349b2678b2e1b6d0f1a62b45b
diff --git a/gulpfile.helper.js b/gulpfile.helper.js
index b45e18ff8cdb78606d652df7d869702b0be7c07f..49f9bd34d01c8b0915a0f8c8d55ddebdd06c3d0e 100644
--- a/gulpfile.helper.js
+++ b/gulpfile.helper.js
@@ -32,10 +32,10 @@ module.exports = function (gulp, helperOptions) {
     modules: 'ignore',
     experimental: true
   }
-  if (options.regenerator) {
-    files.specs = helperOptions.polyfills.concat(files.specs)
-  } else {
+  if (!options.regenerator) {
     babelOptions.blacklist = 'regenerator'
+  } else {
+    files.dist = [files.dist].concat(helperOptions.polyfills)
   }
 
   gulp.task('dist', function () {
@@ -54,7 +54,7 @@ module.exports = function (gulp, helperOptions) {
       .pipe(source(options.targetName))
       .pipe(buffer())
       .pipe($.if(options.debug, $.sourcemaps.init({loadMaps: true})))
-      .pipe($.if(!options.debug && options.regenerator, $.babel(babelOptions)))
+      .pipe($.if(true, $.babel(babelOptions)))
       .pipe($.if(!options.debug && options.regenerator, $.uglify()))
       .pipe($.if(options.debug, $.sourcemaps.write('.')))
       .pipe(gulp.dest('./dist/'))
diff --git a/gulpfile.js b/gulpfile.js
index 8fcf38bba41a427b0bc6cefdc313fad0e3fac3ac..6c539c71dcd5310e3adfa46991c5ea889e3063d6 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -48,7 +48,7 @@ var $ = require('gulp-load-plugins')()
 var runSequence = require('run-sequence').use(gulp)
 
 require('./gulpfile.helper.js')(gulp, {
-  polyfills: [],
+  polyfills: ['node_modules/gulp-babel/node_modules/babel-core/node_modules/regenerator/runtime.js'],
   entry: './src/y.js',
   targetName: 'y.js',
   moduleName: 'yjs',