diff --git a/egs/tedlium3/ASR/transducer_stateless/asr_datamodule.py b/egs/tedlium3/ASR/transducer_stateless/asr_datamodule.py
index 02b383fec..537a9042b 100644
--- a/egs/tedlium3/ASR/transducer_stateless/asr_datamodule.py
+++ b/egs/tedlium3/ASR/transducer_stateless/asr_datamodule.py
@@ -210,17 +210,17 @@ class TedLiumAsrDataModule:
             logging.info(
                 f"Time warp factor: {self.args.spec_aug_time_warp_factor}"
             )
-            # Judge num_frame_masks according to Lhotse's version
-            num_frame_masks = (
-                2
-                if (
-                    inspect.signature(SpecAugment.__init__)
-                    .parameters["num_frame_masks"]
-                    .default
-                    == 1
-                )
-                else 10
-            )
+            # Design the value of num_frame_masks according to Lhotse's version.
+            # In different Lhotse's versions, the default of num_frame_masks is
+            # different.
+            num_frame_masks = 10
+            num_frame_masks_parameter = inspect.signature(
+                SpecAugment.__init__
+            ).parameters["num_frame_masks"]
+            if num_frame_masks_parameter.default == 1:
+                num_frame_masks = 2
+            else:
+                num_frame_masks = 10
             logging.info(f"Num frame mask: {num_frame_masks}")
             input_transforms.append(
                 SpecAugment(