diff --git a/app/src/main/assets/web/uploadBook/js/html5_fun.js b/app/src/main/assets/web/uploadBook/js/html5_fun.js
index da497326e..53b8c3314 100644
--- a/app/src/main/assets/web/uploadBook/js/html5_fun.js
+++ b/app/src/main/assets/web/uploadBook/js/html5_fun.js
@@ -141,7 +141,6 @@ try {
 		XHR.upload.addEventListener("loadend", loadend, false);
 		XHR.upload.addEventListener("loadstart", loadstart, false);
 		XHR.open("POST", config.url);
-		XHR.setRequestHeader("Content-Type", "multipart/mixed stream");
 		XHR.send(fd);
 		XHR.onreadystatechange = function () {