diff --git a/.flake8 b/.flake8
index cd55ded73..67fbbdfad 100644
--- a/.flake8
+++ b/.flake8
@@ -9,6 +9,8 @@ per-file-ignores =
     egs/tedlium3/ASR/*/conformer.py: E501,
     egs/gigaspeech/ASR/*/conformer.py: E501,
     egs/librispeech/ASR/pruned_transducer_stateless2/*.py: E501,
+    egs/librispeech/ASR/*/optim.py: E501,
+    egs/librispeech/ASR/*/scaling.py: E501,
 
     # invalid escape sequence (cause by tex formular), W605
     icefall/utils.py: E501, W605