diff --git a/index.js b/index.js
index 8da4625..672294b 100644
--- a/index.js
+++ b/index.js
@@ -23,7 +23,7 @@ module.exports = function (qiniu, option) {
   return through2.obj(function (file, enc, next) {
     var that = this;
     var isIgnore = false;
-    var filePath = path.relative(file.base, file.path);
+    var filePath = path.relative(file.base, file.path).split(path.sep).join('/');
 
     if (file._contents === null) return next();
     option.ignore.forEach(function(item) {