diff --git a/src/main.rs b/src/main.rs
index 3a30277..92ae2b1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -101,7 +101,7 @@ async fn sse_handler(
         .unwrap();
 
     HttpResponse::Ok()
-        .header("content-type", "text/event-stream")
+        .append_header(("content-type", "text/event-stream"))
         .streaming(server_event)
 }