diff --git a/demo/demo_server.c b/demo/demo_server.c
index e8735943..ad40df29 100644
--- a/demo/demo_server.c
+++ b/demo/demo_server.c
@@ -1506,6 +1506,7 @@ xqc_demo_svr_init_conn_settings(xqc_demo_svr_args_t *args)
         .is_interop_mode = args->quic_cfg.is_interop_mode,
         .max_pkt_out_size = args->quic_cfg.max_pkt_sz,
         .adaptive_ack_frequency = 1,
+        .anti_amplification_limit = 3,
     };
 
     xqc_server_set_conn_settings(&conn_settings);