diff --git a/egs/hkust/s5/local/hkust_data_prep.sh b/egs/hkust/s5/local/hkust_data_prep.sh
index 207f03af36b..c7d0e3be334 100755
--- a/egs/hkust/s5/local/hkust_data_prep.sh
+++ b/egs/hkust/s5/local/hkust_data_prep.sh
@@ -75,7 +75,7 @@ cat $train_dir/transcripts.txt |\
   sed -e 's/<noise>\(.\+\)<\/noise>/\1/g' |\
   sed -e 's/((\([^)]\{0,\}\)))/\1/g' |\
   local/hkust_normalize.pl |\
-  python local/hkust_segment.py |\
+  local/hkust_segment.py |\
   awk '{if (NF > 1) print $0;}' > $train_dir/text || exit 1;
 
 cat $dev_dir/transcripts.txt |\
@@ -84,7 +84,7 @@ cat $dev_dir/transcripts.txt |\
   sed -e 's/<noise>\(.\+\)<\/noise>/\1/g' |\
   sed -e 's/((\([^)]\{0,\}\)))/\1/g' |\
   local/hkust_normalize.pl |\
-  python local/hkust_segment.py |\
+  local/hkust_segment.py |\
   awk '{if (NF > 1) print $0;}' > $dev_dir/text || exit 1;
 
 # some data is corrupted. Delete them
diff --git a/egs/hkust/s5/local/hkust_segment.py b/egs/hkust/s5/local/hkust_segment.py
index 92d3add0e3e..d4c2b35a668 100755
--- a/egs/hkust/s5/local/hkust_segment.py
+++ b/egs/hkust/s5/local/hkust_segment.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 #coding:utf-8
 
 from __future__ import print_function