diff --git a/lib/adapters/xhr.js b/lib/adapters/xhr.js
index 1fe7be3afe..d5a27bf855 100644
--- a/lib/adapters/xhr.js
+++ b/lib/adapters/xhr.js
@@ -28,10 +28,6 @@ module.exports = function xhrAdapter(config) {
       }
     }
 
-    if (utils.isFormData(requestData)) {
-      delete requestHeaders['Content-Type']; // Let the browser set it
-    }
-
     var request = new XMLHttpRequest();
 
     // HTTP basic authentication