diff --git a/egs/librispeech/ASR/conformer_ctc/subsampling.py b/egs/librispeech/ASR/conformer_ctc/subsampling.py
index 6a697aa0e..6b1cb128f 100644
--- a/egs/librispeech/ASR/conformer_ctc/subsampling.py
+++ b/egs/librispeech/ASR/conformer_ctc/subsampling.py
@@ -460,7 +460,7 @@ class DerivBalancer(torch.nn.Module):
     def __init__(self, channel_dim: int,
                  threshold: float = 0.05,
                  max_factor: float = 0.01,
-                 min_abs: float = 0.5):
+                 min_abs: float = 0.2):
         super(DerivBalancer, self).__init__()
         self.channel_dim = channel_dim
         self.threshold = threshold