diff --git a/lib/modem.js b/lib/modem.js
index a9b2826..03d2ac3 100644
--- a/lib/modem.js
+++ b/lib/modem.js
@@ -302,6 +302,9 @@ Modem.prototype.buildRequest = function (options, context, data, callback) {
     req.on('upgrade', function (res, sock, head) {
       if (finished === false) {
         finished = true;
+        if (head.length > 0) {
+          sock.unshift(head);
+        }
         return callback(null, sock);
       }
     });