diff --git a/crates/udp_over_tcp/src/main.rs b/crates/udp_over_tcp/src/main.rs
index d012df0..6c806dc 100644
--- a/crates/udp_over_tcp/src/main.rs
+++ b/crates/udp_over_tcp/src/main.rs
@@ -53,7 +53,8 @@ async fn async_main () -> anyhow::Result <()> {
 		tcp_port: PORT_2,
 		udp_port: PORT_3,
 	};
-	let server_task = spawn (server::main (server_cfg));
+	let server_app = server::Listener::new (server_cfg).await?;
+	let server_task = spawn (server_app.run ());
 	
 	let client_cfg = client::Config {
 		udp_eph_port: PORT_0,