diff --git a/src/server.tsx b/src/server.tsx
index 4bbedefd..481ded2a 100644
--- a/src/server.tsx
+++ b/src/server.tsx
@@ -143,7 +143,7 @@ const server = serve({
   idleTimeout: 60,
   maxRequestBodySize: 1024 * 1024 * 1024 * 50, // 50 GB
   routes: {
-    '/og-image.jpg': () => new Response(Bun.file('public/og-image.jpg')),
+    '/og-image.jpg': () => new Response(Bun.file('public/og-image.jpg'), { headers: { 'Content-Type': 'image/jpeg' } }),
     '/api/dev-server-proxy/*': (req, server) => {
       if (req.headers.get('upgrade') === 'websocket') return upgradeDevServerWs(req, server);
       return honoServer.fetch(req, server);