diff --git a/demo/CLI/binary_classification/mapfeat.py b/demo/CLI/binary_classification/mapfeat.py
index 4cb98f652..1c8ac9ab3 100755
--- a/demo/CLI/binary_classification/mapfeat.py
+++ b/demo/CLI/binary_classification/mapfeat.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 
 def loadfmap( fname ):
     fmap = {}
diff --git a/demo/CLI/binary_classification/mknfold.py b/demo/CLI/binary_classification/mknfold.py
index a941f8609..f5e237e36 100755
--- a/demo/CLI/binary_classification/mknfold.py
+++ b/demo/CLI/binary_classification/mknfold.py
@@ -1,4 +1,5 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
+
 import sys
 import random
 
@@ -26,4 +27,3 @@ for l in fi:
 fi.close()
 ftr.close()
 fte.close()
-
diff --git a/demo/CLI/regression/mapfeat.py b/demo/CLI/regression/mapfeat.py
index 01c7035d6..1e0318e99 100755
--- a/demo/CLI/regression/mapfeat.py
+++ b/demo/CLI/regression/mapfeat.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
 
 fo = open('machine.txt', 'w')
 cnt = 6
diff --git a/demo/CLI/regression/mknfold.py b/demo/CLI/regression/mknfold.py
index 3a3c0f647..3e11934d8 100755
--- a/demo/CLI/regression/mknfold.py
+++ b/demo/CLI/regression/mknfold.py
@@ -1,4 +1,5 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
+
 import sys
 import random
 
diff --git a/demo/CLI/yearpredMSD/csv2libsvm.py b/demo/CLI/yearpredMSD/csv2libsvm.py
index 828c95495..0f763501c 100755
--- a/demo/CLI/yearpredMSD/csv2libsvm.py
+++ b/demo/CLI/yearpredMSD/csv2libsvm.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python3
+
 import sys
 fo = open(sys.argv[2], 'w')