diff --git a/lib/adapters/http.js b/lib/adapters/http.js
index af2f59dcd1..439bbe0f0e 100644
--- a/lib/adapters/http.js
+++ b/lib/adapters/http.js
@@ -117,7 +117,9 @@ module.exports = function httpAdapter(config) {
     }
 
     var transport;
-    if (config.maxRedirects === 0) {
+    if (config.transport) {
+      transport = config.transport;
+    } else if (config.maxRedirects === 0) {
       transport = isHttps ? https : http;
     } else {
       if (config.maxRedirects) {