diff --git a/index.js b/index.js
index 2240a40c..2f431afc 100644
--- a/index.js
+++ b/index.js
@@ -11,6 +11,7 @@ module.exports = {
       }),
       parserOptions: {
         ecmaVersion: 2017,
+        sourceType: 'module',
       },
     },
   },