diff --git a/egs/mls_english/ASR/local/utils/asr_datamodule.py b/egs/mls_english/ASR/local/utils/asr_datamodule.py
index f1417c54b..912606bab 100644
--- a/egs/mls_english/ASR/local/utils/asr_datamodule.py
+++ b/egs/mls_english/ASR/local/utils/asr_datamodule.py
@@ -75,7 +75,7 @@ class MLSEnglishHFAsrDataModule:
         )
         group.add_argument(
             "--max-duration",
-            type=int,
+            type=float,
             default=200.0,
             help="Maximum pooled recordings duration (seconds) in a "
             "single batch. You can reduce it if it causes CUDA OOM.",