diff --git a/lib/uploadcare/client/multipart_upload_client.rb b/lib/uploadcare/client/multipart_upload_client.rb
index 6039bc3..f5792c7 100644
--- a/lib/uploadcare/client/multipart_upload_client.rb
+++ b/lib/uploadcare/client/multipart_upload_client.rb
@@ -47,7 +47,7 @@ def upload_complete(uuid)
       private
 
       def form_data_for(file)
-        form_data_file = super(file)
+        form_data_file = super
         {
           filename: form_data_file.filename,
           size: form_data_file.size,