diff --git a/client.go b/client.go
index 6138906..a353e18 100644
--- a/client.go
+++ b/client.go
@@ -8,6 +8,7 @@ import (
 	"bufio"
 	"bytes"
 	"crypto/tls"
+	"encoding/base64"
 	"errors"
 	"io"
 	"io/ioutil"
@@ -265,11 +266,19 @@ func (d *Dialer) Dial(urlStr string, requestHeader http.Header) (*Conn, *http.Re
 	}
 
 	if proxyURL != nil {
+		connectHeader := make(http.Header)
+		if user := proxyURL.User; user != nil {
+			proxyUser := user.Username()
+			if proxyPassword, passwordSet := user.Password(); passwordSet {
+				credential := base64.StdEncoding.EncodeToString([]byte(proxyUser + ":" + proxyPassword))
+				connectHeader.Set("Proxy-Authorization", "Basic "+credential)
+			}
+		}
 		connectReq := &http.Request{
 			Method: "CONNECT",
 			URL:    &url.URL{Opaque: hostPort},
 			Host:   hostPort,
-			Header: make(http.Header),
+			Header: connectHeader,
 		}
 
 		connectReq.Write(netConn)
diff --git a/client_server_test.go b/client_server_test.go
index c67550e..3f7345d 100644
--- a/client_server_test.go
+++ b/client_server_test.go
@@ -7,6 +7,7 @@ package websocket
 import (
 	"crypto/tls"
 	"crypto/x509"
+	"encoding/base64"
 	"io"
 	"io/ioutil"
 	"net"
@@ -175,6 +176,46 @@ func TestProxyDial(t *testing.T) {
 	cstDialer.Proxy = http.ProxyFromEnvironment
 }
 
+func TestProxyAuthorizationDial(t *testing.T) {
+	s := newServer(t)
+	defer s.Close()
+
+	surl, _ := url.Parse(s.URL)
+	surl.User = url.UserPassword("username", "password")
+	cstDialer.Proxy = http.ProxyURL(surl)
+
+	connect := false
+	origHandler := s.Server.Config.Handler
+
+	// Capture the request Host header.
+	s.Server.Config.Handler = http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			proxyAuth := r.Header.Get("Proxy-Authorization")
+			expectedProxyAuth := "Basic " + base64.StdEncoding.EncodeToString([]byte("username:password"))
+			if r.Method == "CONNECT" && proxyAuth == expectedProxyAuth {
+				connect = true
+				w.WriteHeader(200)
+				return
+			}
+
+			if !connect {
+				t.Log("connect with proxy authorization not recieved")
+				http.Error(w, "connect with proxy authorization not recieved", 405)
+				return
+			}
+			origHandler.ServeHTTP(w, r)
+		})
+
+	ws, _, err := cstDialer.Dial(s.URL, nil)
+	if err != nil {
+		t.Fatalf("Dial: %v", err)
+	}
+	defer ws.Close()
+	sendRecv(t, ws)
+
+	cstDialer.Proxy = http.ProxyFromEnvironment
+}
+
 func TestDial(t *testing.T) {
 	s := newServer(t)
 	defer s.Close()