diff --git a/packages/fes-plugin-windicss/src/index.js b/packages/fes-plugin-windicss/src/index.js
index 27054df9..2625fddb 100644
--- a/packages/fes-plugin-windicss/src/index.js
+++ b/packages/fes-plugin-windicss/src/index.js
@@ -7,6 +7,9 @@ export default (api) => {
     api.describe({
         key: 'windicss',
         config: {
+            schema(joi) {
+                return joi.object();
+            },
             default: {}
         }
     });