diff --git a/src/llmtuner/hparams/finetuning_args.py b/src/llmtuner/hparams/finetuning_args.py
index 7af896fa..1730a6b9 100644
--- a/src/llmtuner/hparams/finetuning_args.py
+++ b/src/llmtuner/hparams/finetuning_args.py
@@ -157,7 +157,7 @@ class ExportArguments:
         default=128,
         metadata={"help": "The number of samples used for quantization."}
     )
-    export_quantization_maxlen: Optional[str] = field(
+    export_quantization_maxlen: Optional[int] = field(
         default=1024,
         metadata={"help": "The maximum length of the model inputs used for quantization."}
     )