diff --git a/lib/adapters/http.js b/lib/adapters/http.js
index 5d6c7f9..73dc26e 100644
--- a/lib/adapters/http.js
+++ b/lib/adapters/http.js
@@ -94,6 +94,8 @@ module.exports = function httpAdapter(config) {
 
     if (proxy) {
       options.host = proxy.host;
+      options.hostname = proxy.host;
+      options.headers.host = parsed.hostname + (parsed.port ? ':' + parsed.port : '');
       options.port = proxy.port;
       options.path = parsed.protocol + '//' + parsed.hostname + (parsed.port ? ':' + parsed.port : '') + options.path;
     }