diff --git a/api/sse/index.js b/api/sse/index.js
index d346647..8545c10 100644
--- a/api/sse/index.js
+++ b/api/sse/index.js
@@ -7,8 +7,10 @@ export function registerSse(app) {
     res.set({
       'Content-Type': 'text/event-stream',
       'Cache-Control': 'no-cache',
-      Connection: 'keep-alive'
+      'Connection': 'keep-alive',
+      'X-Accel-Buffering': 'no'   // 👈 desactiva el buffering en Nginx
     });
+
     res.flushHeaders();
 
     // Primer “hola”