diff --git a/plugins/talk-plugin-auth/client/login/components/External.js b/plugins/talk-plugin-auth/client/login/components/External.js
index 53868464e..048a9269a 100644
--- a/plugins/talk-plugin-auth/client/login/components/External.js
+++ b/plugins/talk-plugin-auth/client/login/components/External.js
@@ -1,10 +1,11 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 import t from 'coral-framework/services/i18n';
 import styles from './External.css';
 import { Slot } from 'plugin-api/beta/client/components';
 import { IfSlotIsNotEmpty } from 'plugin-api/beta/client/components';
 
-const External = slot => (
+const External = ({ slot }) => (
   <div>
     <IfSlotIsNotEmpty slot={slot}>
       <div className={styles.external}>
@@ -17,4 +18,8 @@ const External = slot => (
   </div>
 );
 
+External.propTypes = {
+  slot: PropTypes.string.isRequired,
+};
+
 export default External;