diff --git a/tls.go b/tls.go
index 56f00589..15d5e266 100644
--- a/tls.go
+++ b/tls.go
@@ -97,20 +97,19 @@ func tlsDialWithDialer(dialer *net.Dialer, network, addr string, config *tls.Con
 // this exists to silent an error message in go vet
 func copyTLSConfig(cfg *tls.Config) *tls.Config {
 	return &tls.Config{
-		Certificates:             cfg.Certificates,
-		CipherSuites:             cfg.CipherSuites,
-		ClientAuth:               cfg.ClientAuth,
-		ClientCAs:                cfg.ClientCAs,
-		ClientSessionCache:       cfg.ClientSessionCache,
-		CurvePreferences:         cfg.CurvePreferences,
-		InsecureSkipVerify:       cfg.InsecureSkipVerify,
-		MaxVersion:               cfg.MaxVersion,
-		MinVersion:               cfg.MinVersion,
-		NextProtos:               cfg.NextProtos,
-		PreferServerCipherSuites: cfg.PreferServerCipherSuites,
-		Rand:                     cfg.Rand,
-		RootCAs:                  cfg.RootCAs,
-		ServerName:               cfg.ServerName,
-		SessionTicketsDisabled:   cfg.SessionTicketsDisabled,
+		Certificates:           cfg.Certificates,
+		CipherSuites:           cfg.CipherSuites,
+		ClientAuth:             cfg.ClientAuth,
+		ClientCAs:              cfg.ClientCAs,
+		ClientSessionCache:     cfg.ClientSessionCache,
+		CurvePreferences:       cfg.CurvePreferences,
+		InsecureSkipVerify:     cfg.InsecureSkipVerify,
+		MaxVersion:             cfg.MaxVersion,
+		MinVersion:             cfg.MinVersion,
+		NextProtos:             cfg.NextProtos,
+		Rand:                   cfg.Rand,
+		RootCAs:                cfg.RootCAs,
+		ServerName:             cfg.ServerName,
+		SessionTicketsDisabled: cfg.SessionTicketsDisabled,
 	}
 }