diff --git a/model_training_nnn/rnn_trainer.py b/model_training_nnn/rnn_trainer.py
index 201cabc..4428d11 100644
--- a/model_training_nnn/rnn_trainer.py
+++ b/model_training_nnn/rnn_trainer.py
@@ -46,6 +46,7 @@ class BrainToTextDecoder_Trainer:
             gradient_accumulation_steps=args.get('gradient_accumulation_steps', 1),
             log_with=None,  # We'll use our own logging
             project_dir=args.get('output_dir', './output'),
+            even_batches=False,  # Required for batch_size=None DataLoaders
         )
 
         # Note: even_batches is handled automatically by Accelerator based on our DataLoader configuration