diff --git a/lib/http.js b/lib/http.js
index d650733..2883885 100644
--- a/lib/http.js
+++ b/lib/http.js
@@ -54,6 +54,7 @@ var HTTPObject = function() {
                 var _k = key.toLowerCase();
                 var _v = headers[key].toLowerCase();
                 if (_k === "content-type" && _v === "application/json") {
+                    this.dataType = "json";
                     return true;
                 }
             }