diff --git a/lib/method.js b/lib/method.js
index 586adac..6fc0278 100644
--- a/lib/method.js
+++ b/lib/method.js
@@ -119,8 +119,9 @@ module.exports = function(data, key) {
       function done(err, res) {
         var result;
 
-        if (!data.isBinary) {
-          result = data.isJSON ? res.body : res.text;
+        var isJSON = res.headers['content-type'] === 'application/json';
+        if (!data.isBinary || isJSON) {
+          result = data.isJSON || isJSON ? res.body : res.text;
           callback(null, result);
           resolve(result);
         } else {