--- a/misc/guess-ploidy.py
+++ b/misc/guess-ploidy.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 #
 # Plot the output of "bcftools +guess-ploidy -v"
 #
--- a/misc/plot-roh.py
+++ b/misc/plot-roh.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python2.7
 
 import glob, gzip, csv, sys, os, copy, re
 csv.register_dialect('tab', delimiter='\t', quoting=csv.QUOTE_NONE)
--- a/misc/vcfutils.pl
+++ b/misc/vcfutils.pl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl -w
+#!/usr/bin/env perl
 #
 #   Copyright (C) 2010 Broad Institute.
 #   Copyright (C) 2011, 2014 Genome Research Ltd.