diff --git a/js/src/admin/components/UserListPage.tsx b/js/src/admin/components/UserListPage.tsx
index 6665ccbb0..cbc790cfb 100644
--- a/js/src/admin/components/UserListPage.tsx
+++ b/js/src/admin/components/UserListPage.tsx
@@ -286,7 +286,7 @@ export default class UserListPage extends AdminPage {
 
           return (
             <div class="UserList-email" key={user.id()} data-email-shown="false">
-              <span class="UserList-emailAddress" aria-hidden onclick={() => setEmailVisibility(true)}>
+              <span class="UserList-emailAddress" aria-hidden="true" onclick={() => setEmailVisibility(true)}>
                 {user.email()}
               </span>
               <button
diff --git a/js/src/common/components/LoadingIndicator.tsx b/js/src/common/components/LoadingIndicator.tsx
index 7b1cc8841..f99575747 100644
--- a/js/src/common/components/LoadingIndicator.tsx
+++ b/js/src/common/components/LoadingIndicator.tsx
@@ -73,7 +73,7 @@ export default class LoadingIndicator extends Component<LoadingIndicatorAttrs> {
         data-size={size}
         className={completeContainerClassName}
       >
-        <div aria-hidden className={completeClassName} {...attrs} />
+        <div aria-hidden="true" className={completeClassName} {...attrs} />
       </div>
     );
   }
diff --git a/js/src/common/helpers/icon.tsx b/js/src/common/helpers/icon.tsx
index cb01a1347..996142a9d 100644
--- a/js/src/common/helpers/icon.tsx
+++ b/js/src/common/helpers/icon.tsx
@@ -9,5 +9,5 @@ import * as Mithril from 'mithril';
 export default function icon(fontClass: string, attrs: Mithril.Attributes = {}): Mithril.Vnode {
   attrs.className = 'icon ' + fontClass + ' ' + (attrs.className || '');
 
-  return <i {...attrs} />;
+  return <i aria-hidden="true" {...attrs} />;
 }