diff --git a/src/main.rs b/src/main.rs
index 969e8fc..246b400 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1311,8 +1311,7 @@ impl SockudoServer {
                     .map(|(_app_id, ws_raw_obj)| {
                         async move {
                             let mut ws = ws_raw_obj.inner.lock().await; // Lock the WebSocketRef
-                            if let Err(e) =
-                                ws.close(4009, "User terminated by app.".to_string()).await
+                            if let Err(e) = ws.close(4200, "Server shutting down".to_string()).await
                             {
                                 error!("Failed to close WebSocket: {:?}", e);
                             }