diff --git a/python/allelebayes.py b/python/allelebayes.py
index 6bf6ba1a..af49ab67 100644
--- a/python/allelebayes.py
+++ b/python/allelebayes.py
@@ -1,3 +1,5 @@
+#!/usr/bin/env python
+
 # calculates data likelihoods for sets of alleles
 
 import multiset
diff --git a/python/multiset.py b/python/multiset.py
index 4a4942b7..5ed41f30 100644
--- a/python/multiset.py
+++ b/python/multiset.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 """
 multiset.py  -- non-recursive n multichoose k and
diff --git a/scripts/fasta_generate_regions.py b/scripts/fasta_generate_regions.py
index 04334104..5e28744e 100755
--- a/scripts/fasta_generate_regions.py
+++ b/scripts/fasta_generate_regions.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 import sys
 
diff --git a/scripts/sam_add_rg.pl b/scripts/sam_add_rg.pl
index cf5892a5..108d9d1e 100644
--- a/scripts/sam_add_rg.pl
+++ b/scripts/sam_add_rg.pl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 #