diff --git a/bob/ip/binseg/engine/valtrainer.py b/bob/ip/binseg/engine/valtrainer.py
index 838798ee0a3a648807c8c3db28409e759ce4f060..8a758b712df21e2db2f2491497b8f686f1f0c421 100644
--- a/bob/ip/binseg/engine/valtrainer.py
+++ b/bob/ip/binseg/engine/valtrainer.py
@@ -93,7 +93,7 @@ def do_valtrain(
 
             if epoch % checkpoint_period == 0:
                 checkpointer.save("model_{:03d}".format(epoch), **arguments)
-                val_folder = os.path.join((output_folder,epoch))
+                val_folder = os.path.join(output_folder,epoch)
                 do_inference(model,val_loader, device, val_folder)
 
             if epoch == max_epoch: