diff --git a/lib/adapters/xhr.js b/lib/adapters/xhr.js
index 5db1d1ef63..f83f1444bc 100644
--- a/lib/adapters/xhr.js
+++ b/lib/adapters/xhr.js
@@ -18,6 +18,13 @@ module.exports = function xhrAdapter(config) {
       delete requestHeaders['Content-Type']; // Let the browser set it
     }
 
+    if (
+      (utils.isBlob(requestData) || utils.isFile(requestData)) &&
+      requestData.type
+    ) {
+      delete requestHeaders['Content-Type']; // Let the browser set it
+    }
+
     var request = new XMLHttpRequest();
 
     // HTTP basic authentication