diff --git a/src/ui/Root.tsx b/src/ui/Root.tsx
index 8cd65722..e8efc2fe 100644
--- a/src/ui/Root.tsx
+++ b/src/ui/Root.tsx
@@ -58,7 +58,7 @@ export default React.memo(() => {
           <NavLink to="/site" activeClassName="active">
             <h2 dangerouslySetInnerHTML={{__html: t("site.site")}} />
           </NavLink>
-          {config.mirrorz_help && <a href={config.mirrorz_help} target="_blank">
+          {config.mirrorz_help && <a href={config.mirrorz_help} target="_blank" rel="noopener">
             <h2 dangerouslySetInnerHTML={{__html: t("help")}} /><Icon>open_in_new</Icon>
           </a>}
           <NavLink to="/about" activeClassName="active">