diff --git a/src/proxy.rs b/src/proxy.rs
index a598f31056..82b53b0947 100644
--- a/src/proxy.rs
+++ b/src/proxy.rs
@@ -115,19 +115,15 @@ impl DefaultSocketFactory {
                 .with_time(cfg.keepalive_time)
                 .with_retries(cfg.keepalive_retries)
                 .with_interval(cfg.keepalive_interval);
-            tracing::trace!(
-                "set keepalive: {:?}",
-                socket2::SockRef::from(&s).set_tcp_keepalive(&ka)
-            );
+            let res = socket2::SockRef::from(&s).set_tcp_keepalive(&ka);
+            tracing::trace!("set keepalive: {:?}", res);
         }
         if cfg.user_timeout_enabled {
             // https://blog.cloudflare.com/when-tcp-sockets-refuse-to-die/
             // TCP_USER_TIMEOUT = TCP_KEEPIDLE + TCP_KEEPINTVL * TCP_KEEPCNT.
             let ut = cfg.keepalive_time + cfg.keepalive_retries * cfg.keepalive_interval;
-            tracing::trace!(
-                "set user timeout: {:?}",
-                socket2::SockRef::from(&s).set_tcp_user_timeout(Some(ut))
-            );
+            let res = socket2::SockRef::from(&s).set_tcp_user_timeout(Some(ut));
+            tracing::trace!("set user timeout: {:?}", res);
         }
         Ok(())
     }
diff --git a/src/socket.rs b/src/socket.rs
index 6acd222ffa..337f5b377c 100644
--- a/src/socket.rs
+++ b/src/socket.rs
@@ -175,17 +175,13 @@ impl Listener {
                     .with_time(cfg.keepalive_time)
                     .with_retries(cfg.keepalive_retries)
                     .with_interval(cfg.keepalive_interval);
-                tracing::trace!(
-                    "set keepalive: {:?}",
-                    SockRef::from(&stream).set_tcp_keepalive(&ka)
-                );
+                let res = SockRef::from(&stream).set_tcp_keepalive(&ka);
+                tracing::trace!("set keepalive: {:?}", res);
             }
             if cfg.user_timeout_enabled {
                 let ut = cfg.keepalive_time + cfg.keepalive_retries * cfg.keepalive_interval;
-                tracing::trace!(
-                    "set user timeout: {:?}",
-                    SockRef::from(&stream).set_tcp_user_timeout(Some(ut))
-                );
+                let res = SockRef::from(&stream).set_tcp_user_timeout(Some(ut));
+                tracing::trace!("set user timeout: {:?}", res);
             }
         }
         Ok((stream, remote))