diff --git a/benches/latency.rs b/benches/latency.rs
index a5b913d..4de77a4 100644
--- a/benches/latency.rs
+++ b/benches/latency.rs
@@ -28,7 +28,7 @@ struct Server;
 
 impl FutureService for Server {
     type AckFut = futures::Finished<(), Never>;
-    fn ack(&self) -> Self::AckFut {
+    fn ack(&mut self) -> Self::AckFut {
         futures::finished(())
     }
 }
@@ -37,8 +37,8 @@ impl FutureService for Server {
 #[bench]
 fn latency(bencher: &mut Bencher) {
     let _ = env_logger::init();
-    let server = Server.listen("localhost:0".first_socket_addr()).wait().unwrap();
-    let client = SyncClient::connect(server.local_addr()).unwrap();
+    let addr = Server.listen("localhost:0".first_socket_addr()).wait().unwrap();
+    let mut client = SyncClient::connect(addr).unwrap();
 
     bencher.iter(|| {
         client.ack().unwrap();