diff --git a/route/conn.go b/route/conn.go
index c2a2eab9..582562eb 100644
--- a/route/conn.go
+++ b/route/conn.go
@@ -262,7 +262,7 @@ func (m *ConnectionManager) connectionCopy(ctx context.Context, source net.Conn,
 			return
 		}
 	}
-	_, err := bufio.CopyWithCounters(destination, sourceReader, source, readCounters, writeCounters)
+	_, err := bufio.CopyWithCounters(destinationWriter, sourceReader, source, readCounters, writeCounters)
 	if err != nil {
 		common.Close(source, destination)
 	} else if duplexDst, isDuplex := destination.(N.WriteCloser); isDuplex {