diff --git a/proxy.go b/proxy.go
index c332633..e9a4cd0 100644
--- a/proxy.go
+++ b/proxy.go
@@ -15,6 +15,13 @@ import (
 	"strings"
 )
 
+// // proxyDialerEx extends the generated proxy_Dialer
+type proxyDialerEx interface {
+	proxy_Dialer
+	// UsesTLS indicates whether we expect to dial to a TLS proxy
+	UsesTLS() bool
+}
+
 type netDialerFunc struct {
 	fn      func(network, addr string) (net.Conn, error)
 	usesTLS bool
@@ -30,11 +37,11 @@ func (ndf *netDialerFunc) UsesTLS() bool {
 
 func init() {
 	proxy_RegisterDialerType("http", func(proxyURL *url.URL, forwardDialer proxy_Dialer) (proxy_Dialer, error) {
-		return &httpProxyDialer{proxyURL: proxyURL, forwardDial: forwardDialer.Dial, usesTLS: forwardDialer.UsesTLS()}, nil
+		return &httpProxyDialer{proxyURL: proxyURL, forwardDial: forwardDialer.Dial, usesTLS: false}, nil
 	})
 	proxy_RegisterDialerType("https", func(proxyURL *url.URL, forwardDialer proxy_Dialer) (proxy_Dialer, error) {
 		fwd := forwardDialer.Dial
-		if !forwardDialer.UsesTLS() {
+		if dialerEx, ok := forwardDialer.(proxyDialerEx); !ok || !dialerEx.UsesTLS() {
 			tlsDialer := &tls.Dialer{
 				Config:    &tls.Config{},
 				NetDialer: &net.Dialer{},
diff --git a/x_net_proxy.go b/x_net_proxy.go
index f05a113..2e668f6 100644
--- a/x_net_proxy.go
+++ b/x_net_proxy.go
@@ -27,10 +27,6 @@ func (proxy_direct) Dial(network, addr string) (net.Conn, error) {
 	return net.Dial(network, addr)
 }
 
-func (proxy_direct) UsesTLS() bool {
-	return false
-}
-
 // A PerHost directs connections to a default Dialer unless the host name
 // requested matches one of a number of exceptions.
 type proxy_PerHost struct {
@@ -63,10 +59,6 @@ func (p *proxy_PerHost) Dial(network, addr string) (c net.Conn, err error) {
 	return p.dialerForRequest(host).Dial(network, addr)
 }
 
-func (p *proxy_PerHost) UsesTLS() bool {
-	return p.def.UsesTLS() || p.bypass.UsesTLS()
-}
-
 func (p *proxy_PerHost) dialerForRequest(host string) proxy_Dialer {
 	if ip := net.ParseIP(host); ip != nil {
 		for _, net := range p.bypassNetworks {
@@ -169,8 +161,6 @@ func (p *proxy_PerHost) AddHost(host string) {
 type proxy_Dialer interface {
 	// Dial connects to the given address via the proxy.
 	Dial(network, addr string) (c net.Conn, err error)
-	// UsesTLS indicates whether we expect to dial to a TLS proxy
-	UsesTLS() bool
 }
 
 // Auth contains authentication parameters that specific Dialers may require.
@@ -348,10 +338,6 @@ func (s *proxy_socks5) Dial(network, addr string) (net.Conn, error) {
 	return conn, nil
 }
 
-func (s *proxy_socks5) UsesTLS() bool {
-	return s.forward.UsesTLS()
-}
-
 // connect takes an existing connection to a socks5 proxy server,
 // and commands the server to extend that connection to target,
 // which must be a canonical address with a host and port.