diff --git a/src/app/layout.tsx b/src/app/layout.tsx
index a69d160..9ba9f15 100644
--- a/src/app/layout.tsx
+++ b/src/app/layout.tsx
@@ -7,6 +7,7 @@ import { Navbar } from '@/components/Navbar'
 const inter = Inter({ subsets: ['latin'] })
 
 export const metadata: Metadata = {
+  metadataBase: new URL(process.env.NEXTAUTH_URL ?? 'http://localhost:3000'),
   title: 'HashEx — The Hashtag Exchange',
   description: 'Trade hashtags like stocks. Prices driven by real Mastodon activity.',
 }