diff --git a/lib/storage-handler.js b/lib/storage-handler.js
index 2abd4ec..308bc54 100644
--- a/lib/storage-handler.js
+++ b/lib/storage-handler.js
@@ -135,6 +135,7 @@ exports.upload = function (provider, req, res, options, cb) {
     if (maxFileSize) {
       part.on('data', function (buffer) {
         fileSize += buffer.length;
+        file.size = fileSize;
         if (fileSize > maxFileSize) {
           // We are missing some way to tell the provider to cancel upload/multipart upload of the current file.
           // - s3-upload-stream doesn't provide a way to do this in it's public interface