diff --git a/components/common/Loading.js b/components/common/Loading.js
index 46e72f17..16d8bb8a 100644
--- a/components/common/Loading.js
+++ b/components/common/Loading.js
@@ -1,8 +1,9 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 import classNames from 'classnames';
 import styles from './Loading.module.css';
 
-export default function Loading({ className }) {
+function Loading({ className }) {
   return (
     <div className={classNames(styles.loading, className)}>
       <div />
@@ -11,3 +12,9 @@ export default function Loading({ className }) {
     </div>
   );
 }
+
+Loading.propTypes = {
+  className: PropTypes.string,
+};
+
+export default Loading;