diff --git a/.flake8 b/.flake8
index c56cd6fba..229cf1d6c 100644
--- a/.flake8
+++ b/.flake8
@@ -6,6 +6,7 @@ per-file-ignores =
     # line too long
     egs/librispeech/ASR/*/conformer.py: E501,
     egs/aishell/ASR/*/conformer.py: E501,
+    egs/tedlium3/ASR/*/conformer.py: E501,
     # invalid escape sequence (cause by tex formular), W605
     icefall/utils.py: E501, W605