diff --git a/index.d.ts b/index.d.ts
index 331b8f2d..38e0d220 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -61,7 +61,7 @@ export interface ProviderOptions {
   /**
    * Connect through an HTTP proxy
    */
-  proxy?: { host: string, port: number|string }
+  proxy?: { host: string, port: number|string, user?: string, pass?: string }
 }
 
 export interface MultiProviderOptions extends ProviderOptions {
@@ -154,7 +154,7 @@ export class MultiProvider extends EventEmitter {
    * Set an info logger, and optionally an errorLogger to separately log errors.
    *
    * In order to log, these functions must have a property '.enabled' that is true.
-   * (The default logger uses the npm 'debug' module which sets '.enabled' 
+   * (The default logger uses the npm 'debug' module which sets '.enabled'
    * based on the DEBUG environment variable)
    */
   setLogger(logger: (msg: string) => void, errorLogger?: (msg: string) => void): Promise<Responses>;
diff --git a/lib/util/proxy.js b/lib/util/proxy.js
index f91e3b0a..82fead1d 100644
--- a/lib/util/proxy.js
+++ b/lib/util/proxy.js
@@ -2,12 +2,18 @@ const http = require('http');
 
 module.exports = function createProxySocket(proxy, target) {
   return new Promise((resolve, reject) => {
+    let headers = { Connection: "Keep-Alive" };
+    if (proxy.user && proxy.pass) {
+      const token = Buffer.from(`${proxy.user}:${proxy.pass}`).toString('base64')
+      headers["Proxy-Authorization"] = `Basic ${token}`
+    }
+
     const req = http.request({
       host: proxy.host,
       port: proxy.port,
-      method: 'connect',
-      path: target.host + ':' + target.port,
-      headers: { Connection: 'Keep-Alive' },
+      method: "connect",
+      path: target.host + ":" + target.port,
+      headers: headers,
     });
     req.on('error', reject);
     req.on('connect', (res, socket, head) => {