diff --git a/src/net/http/transport.go b/src/net/http/transport.go
index c23042b1e3..ab8fd46fb1 100644
--- a/src/net/http/transport.go
+++ b/src/net/http/transport.go
@@ -44,7 +44,6 @@ var DefaultTransport RoundTripper = &Transport{
 	DialContext: (&net.Dialer{
 		Timeout:   30 * time.Second,
 		KeepAlive: 30 * time.Second,
-		DualStack: true,
 	}).DialContext,
 	ForceAttemptHTTP2:     true,
 	MaxIdleConns:          100,