diff --git a/package.json b/package.json
index 2213b30..7352200 100644
--- a/package.json
+++ b/package.json
@@ -39,6 +39,7 @@
     "jquery": "^3.5.1",
     "locale": "^0.1.0",
     "node-sass": "^4.14.1",
+    "prop-types": "^15.7.2",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-helmet": "^6.1.0",
diff --git a/src/pages/404.js b/src/pages/404.js
index ffd554e..97cab5f 100644
--- a/src/pages/404.js
+++ b/src/pages/404.js
@@ -5,7 +5,7 @@ import Layout from "../layouts/default"
 // markup
 const NotFoundPage = () => {
   return (
-    <Layout title="Not found">
+    <Layout title="Not found" module="error">
       <section>
         <article>
           <h1>Page not found</h1>