diff --git a/egs/librispeech/ASR/conformer_ctc/ali.py b/egs/librispeech/ASR/conformer_ctc/ali.py
index 3d817a8f6..ad72a88e7 100755
--- a/egs/librispeech/ASR/conformer_ctc/ali.py
+++ b/egs/librispeech/ASR/conformer_ctc/ali.py
@@ -63,7 +63,7 @@ def get_parser():
     parser.add_argument(
         "--lang-dir",
         type=str,
-        default="data/lang_bpe_5000",
+        default="data/lang_bpe_500",
         help="The lang dir",
     )
 
diff --git a/egs/librispeech/ASR/conformer_ctc/decode.py b/egs/librispeech/ASR/conformer_ctc/decode.py
index b4b0d7f37..e687c5bc4 100755
--- a/egs/librispeech/ASR/conformer_ctc/decode.py
+++ b/egs/librispeech/ASR/conformer_ctc/decode.py
@@ -143,7 +143,7 @@ def get_parser():
     parser.add_argument(
         "--lang-dir",
         type=str,
-        default="data/lang_bpe_5000",
+        default="data/lang_bpe_500",
         help="The lang dir",
     )
 
diff --git a/egs/librispeech/ASR/conformer_ctc/export.py b/egs/librispeech/ASR/conformer_ctc/export.py
index 79e026dac..28c28df01 100755
--- a/egs/librispeech/ASR/conformer_ctc/export.py
+++ b/egs/librispeech/ASR/conformer_ctc/export.py
@@ -65,7 +65,7 @@ def get_parser():
     parser.add_argument(
         "--lang-dir",
         type=str,
-        default="data/lang_bpe_5000",
+        default="data/lang_bpe_500",
         help="""It contains language related input files such as "lexicon.txt"
         """,
     )