diff --git a/lib/core/nav/HeaderNav.js b/lib/core/nav/HeaderNav.js
index 506876c42f..488f24b2e5 100644
--- a/lib/core/nav/HeaderNav.js
+++ b/lib/core/nav/HeaderNav.js
@@ -61,7 +61,7 @@ class LanguageDropDown extends React.Component {
 
     return (
       <span>
-        <li>
+        <li key="languages">
           <a id="languages-menu" href="#">
             <img
               className="languages-icon"
@@ -109,7 +109,7 @@ class HeaderNav extends React.Component {
     if (link.search && this.props.config.algolia) {
       // return algolia search bar
       return (
-        <li className="navSearchWrapper reactNavSearchWrapper">
+        <li className="navSearchWrapper reactNavSearchWrapper" key="search">
           <input id="search_input_react" type="text" placeholder="Search" />
         </li>
       );
@@ -119,6 +119,7 @@ class HeaderNav extends React.Component {
         <LanguageDropDown
           baseUrl={this.props.baseUrl}
           language={this.props.language}
+          key="languagedropdown"
         />
       );
     } else if (link.doc) {
@@ -157,7 +158,7 @@ class HeaderNav extends React.Component {
       href = this.props.baseUrl + "blog";
     }
     return (
-      <li>
+      <li key={link.label + "page"}>
         <a href={href} target={link.external ? "_blank" : "_self"}>
           {translation[this.props.language]
             ? translation[this.props.language]["localized-strings"][link.label]
diff --git a/website/pages/en/index.js b/website/pages/en/index.js
index 6b4ec0f07e..239b6d4024 100755
--- a/website/pages/en/index.js
+++ b/website/pages/en/index.js
@@ -76,9 +76,9 @@ class Index extends React.Component {
       .filter(user => {
         return user.pinned;
       })
-      .map(user => {
+      .map((user, i) => {
         return (
-          <a href={user.infoLink}>
+          <a href={user.infoLink} key={i}>
             <img src={user.image} title={user.caption} />
           </a>
         );