diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index 5f3631b89..54d6cc69e 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -161,6 +161,9 @@ func (s3a *S3ApiServer) proxyToFiler(w http.ResponseWriter, r *http.Request, des
 	for header, values := range r.Header {
 		proxyReq.Header[header] = values
 	}
+	if proxyReq.ContentLength == 0 && r.ContentLength != 0 {
+		proxyReq.ContentLength = r.ContentLength
+	}
 
 	// ensure that the Authorization header is overriding any previous
 	// Authorization header which might be already present in proxyReq