diff --git a/lib/client/HttpClient.js b/lib/client/HttpClient.js
index 3174b68..a60a4fc 100644
--- a/lib/client/HttpClient.js
+++ b/lib/client/HttpClient.js
@@ -126,7 +126,7 @@ function HttpClient(uri, functions, settings) {
     var self = this;
 
     function getRequestHeader(headers) {
-        var header = {};
+        var header = Object.create(null);
         var name, value;
         for (name in _header) {
             header[name] = _header[name];