diff --git a/openprompt/pipeline_base.py b/openprompt/pipeline_base.py
index 2802755..7807f61 100644
--- a/openprompt/pipeline_base.py
+++ b/openprompt/pipeline_base.py
@@ -48,7 +48,7 @@ def __init__(self,
                  tokenizer: PreTrainedTokenizer = None,
                  tokenizer_wrapper_class = None,
                  verbalizer: Optional[Verbalizer] = None,
-                 max_seq_length: Optional[str] = 512,
+                 max_seq_length: Optional[int] = 512,
                  batch_size: Optional[int] = 1,
                  shuffle: Optional[bool] = False,
                  teacher_forcing: Optional[bool] = False,
diff --git a/tutorial/7_ernie_paddlepaddle/dataloader.py b/tutorial/7_ernie_paddlepaddle/dataloader.py
index 04a5b1d..34504c5 100644
--- a/tutorial/7_ernie_paddlepaddle/dataloader.py
+++ b/tutorial/7_ernie_paddlepaddle/dataloader.py
@@ -59,7 +59,7 @@ def __init__(self,
              tokenizer = None,
              tokenizer_wrapper_class = None,
              verbalizer = None,
-             max_seq_length: Optional[str] = 512,
+             max_seq_length: Optional[int] = 512,
              batch_size: Optional[int] = 1,
              shuffle: Optional[bool] = False,
              teacher_forcing: Optional[bool] = False,