diff --git a/egs/reazonspeech/ASR/local/utils/asr_datamodule.py b/egs/reazonspeech/ASR/local/utils/asr_datamodule.py
index 3bbd48a43..60e4147be 100644
--- a/egs/reazonspeech/ASR/local/utils/asr_datamodule.py
+++ b/egs/reazonspeech/ASR/local/utils/asr_datamodule.py
@@ -174,7 +174,7 @@ class ReazonSpeechAsrDataModule:
         group.add_argument(
             "--enable-musan",
             type=str2bool,
-            default=True,
+            default=False,
             help="When enabled, select noise from MUSAN and mix it"
             "with training dataset. ",
         )
diff --git a/egs/reazonspeech/ASR/zipformer/train.py b/egs/reazonspeech/ASR/zipformer/train.py
index b4d641935..0bd2542fe 100755
--- a/egs/reazonspeech/ASR/zipformer/train.py
+++ b/egs/reazonspeech/ASR/zipformer/train.py
@@ -1221,9 +1221,12 @@ def run(rank, world_size, args):
         sampler_state_dict = None
 
     if args.enable_musan:
-        cuts_musan = load_manifest(Path(args.manifest_dir) / "musan_cuts.jsonl.gz")
-    else:
-        cuts_musan = None
+        musan_path = Path(args.manifest_dir) / "musan_cuts.jsonl.gz"
+        if musan_path.exists():
+            cuts_musan = load_manifest(musan_path)
+            logging.info(f"Loaded MUSAN manifest from {musan_path}")
+        else:
+            cuts_musan = None
 
     train_dl = reazonspeech_corpus.train_dataloaders(
         train_cuts,