diff --git a/src/transformers/tokenization_bart.py b/src/transformers/tokenization_bart.py
index bc346074bd4d..8337c06a6176 100644
--- a/src/transformers/tokenization_bart.py
+++ b/src/transformers/tokenization_bart.py
@@ -61,7 +61,7 @@ def prepare_seq2seq_batch(
         max_length: Optional[int] = None,
         max_target_length: Optional[int] = None,
         padding: str = "longest",
-        return_tensors: str = "None",
+        return_tensors: str = "pt",
         truncation=True,
         **kwargs,
     ) -> BatchEncoding: