diff --git a/transport/internet/system_dialer.go b/transport/internet/system_dialer.go
index e6783d0a523..09ad1539fe2 100644
--- a/transport/internet/system_dialer.go
+++ b/transport/internet/system_dialer.go
@@ -73,7 +73,7 @@ func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest ne
 		KeepAlive: goStdKeepAlive,
 	}
 
-	if sockopt != nil {
+	if dest.Network == net.Network_TCP && sockopt != nil {
 		switch sockopt.Mptcp {
 		case MPTCPState_Enable:
 			dialer.SetMultipathTCP(true)