diff --git a/components/common/Favicon.js b/components/common/Favicon.js
index 07ec696c..d72cd3c7 100644
--- a/components/common/Favicon.js
+++ b/components/common/Favicon.js
@@ -1,4 +1,5 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 import styles from './Favicon.module.css';
 
 function getHostName(url) {
@@ -6,7 +7,7 @@ function getHostName(url) {
   return match && match.length > 1 ? match[1] : null;
 }
 
-export default function Favicon({ domain, ...props }) {
+function Favicon({ domain, ...props }) {
   const hostName = domain ? getHostName(domain) : null;
 
   return hostName ? (
@@ -19,3 +20,9 @@ export default function Favicon({ domain, ...props }) {
     />
   ) : null;
 }
+
+Favicon.propTypes = {
+  domain: PropTypes.string,
+};
+
+export default Favicon;