diff --git a/trl/scripts/grpo.py b/trl/scripts/grpo.py
index 552f6c3a4c..4b336b28e9 100644
--- a/trl/scripts/grpo.py
+++ b/trl/scripts/grpo.py
@@ -60,7 +60,7 @@ def main(script_args, training_args, model_args):
     # Initialize the GRPO trainer
     trainer = GRPOTrainer(
         model=model,
-        reward_model=reward_model,
+        reward_funcs=reward_model,
         args=training_args,
         train_dataset=dataset[script_args.dataset_train_split],
         eval_dataset=dataset[script_args.dataset_test_split] if training_args.eval_strategy != "no" else None,