diff --git a/.index.js.swp b/.index.js.swp
new file mode 100644
index 0000000..e007244
Binary files /dev/null and b/.index.js.swp differ
diff --git a/index.js b/index.js
index 26cbcd7..52da613 100644
--- a/index.js
+++ b/index.js
@@ -45,6 +45,9 @@ module.exports = function (b, opts) {
   var uglifyOpts = {
     output: {
       ascii_only: true
+    },
+    mangle: {
+      safari10: true
     }
   }
   if (!b._options.debug) {