diff --git a/egs/librispeech/ASR/conformer_ctc/conformer.py b/egs/librispeech/ASR/conformer_ctc/conformer.py
index 22d9d8193..871712a46 100644
--- a/egs/librispeech/ASR/conformer_ctc/conformer.py
+++ b/egs/librispeech/ASR/conformer_ctc/conformer.py
@@ -878,7 +878,7 @@ class ConvolutionModule(nn.Module):
             groups=channels,
             bias=bias,
         )
-        if self.use_bathnorm:
+        if self.use_batchnorm:
             self.norm = nn.BatchNorm1d(channels)
         self.pointwise_conv2 = nn.Conv1d(
             channels,
diff --git a/egs/librispeech/ASR/conformer_ctc/transformer.py b/egs/librispeech/ASR/conformer_ctc/transformer.py
index 94c0cabf7..086d1f2b8 100644
--- a/egs/librispeech/ASR/conformer_ctc/transformer.py
+++ b/egs/librispeech/ASR/conformer_ctc/transformer.py
@@ -15,7 +15,7 @@
 # limitations under the License.
 
 import math
-from typing import Dict, List, Optional, Tuple
+from typing import Dict, List, Optional, Tuple, Union
 
 import torch
 import torch.nn as nn