diff --git a/trl/trainer/cpo_config.py b/trl/trainer/cpo_config.py
index d231fa83cc..99c74e2c87 100644
--- a/trl/trainer/cpo_config.py
+++ b/trl/trainer/cpo_config.py
@@ -83,3 +83,4 @@ class CPOConfig(TrainingArguments):
     def __post_init__(self):
         if self.loss_type == "kto_pair":
             raise ValueError("Support for kto_pair has been removed in CPOTrainer. Please use KTOTrainer.")
+        return super().__post_init__()
\ No newline at end of file
diff --git a/trl/trainer/dpo_config.py b/trl/trainer/dpo_config.py
index 88b8b2d1fb..38857409b0 100644
--- a/trl/trainer/dpo_config.py
+++ b/trl/trainer/dpo_config.py
@@ -106,3 +106,4 @@ class DPOConfig(TrainingArguments):
     def __post_init__(self):
         if self.loss_type == "kto_pair":
             raise ValueError("Support for kto_pair has been removed in DPOTrainer. Please use KTOTrainer.")
+        return super().__post_init__()