diff --git a/egs/librispeech/ASR/.conv_feat_vis.py.swp b/egs/librispeech/ASR/.conv_feat_vis.py.swp
index 7f0818e79..937db0877 100644
Binary files a/egs/librispeech/ASR/.conv_feat_vis.py.swp and b/egs/librispeech/ASR/.conv_feat_vis.py.swp differ
diff --git a/egs/librispeech/ASR/conv_feat_vis.py b/egs/librispeech/ASR/conv_feat_vis.py
index 40024438b..b019ac86f 100644
--- a/egs/librispeech/ASR/conv_feat_vis.py
+++ b/egs/librispeech/ASR/conv_feat_vis.py
@@ -3,7 +3,7 @@ import numpy as np
 import matplotlib.pyplot as plt
 
 feats = []
-feat_list = glob('./conv_feat/*')
+feat_list = glob('./conv_feat/*.npy')
 for feat in feat_list:
     feat = np.load(feat)
     feats.append(feat)