diff --git a/lib/net/http/generic_request.rb b/lib/net/http/generic_request.rb
index 96396b0..57ad9e0 100644
--- a/lib/net/http/generic_request.rb
+++ b/lib/net/http/generic_request.rb
@@ -301,7 +301,7 @@ def send_request_with_body_stream(sock, ver, path, f)
       IO.copy_stream(f, chunker)
       chunker.finish
     else
-      IO.copy_stream(f, sock)
+      IO.copy_stream(f, sock, content_length())
     end
   end