diff --git a/lib/adapters/http.js b/lib/adapters/http.js
index 32ef61b988..e0cca97060 100755
--- a/lib/adapters/http.js
+++ b/lib/adapters/http.js
@@ -130,7 +130,8 @@ module.exports = function httpAdapter(config) {
         if (shouldProxy) {
           proxy = {
             host: parsedProxyUrl.hostname,
-            port: parsedProxyUrl.port
+            port: parsedProxyUrl.port,
+            protocol: parsedProxyUrl.protocol
           };
 
           if (parsedProxyUrl.auth) {