diff --git a/examples/with-mobx-state-tree/pages/_app.js b/examples/with-mobx-state-tree/pages/_app.js
index 249a4ab6f8c86ef24113248684ce57218b0d10d9..69ca39d6625839012850f5f11f470966811ba2e8 100644
--- a/examples/with-mobx-state-tree/pages/_app.js
+++ b/examples/with-mobx-state-tree/pages/_app.js
@@ -5,7 +5,7 @@ import App, { Container } from 'next/app'
 import { initializeStore } from '../stores/store'
 
 export default class MyApp extends App {
-  static async getInitialProps ({ Component, router, ctx }) {
+  static async getInitialProps ({ Component, ctx }) {
     //
     // Use getInitialProps as a step in the lifecycle when
     // we can initialize our store