diff --git a/DiversityTools/alpha_diversity.py b/DiversityTools/alpha_diversity.py
index 92ed174..e606eca 100755
--- a/DiversityTools/alpha_diversity.py
+++ b/DiversityTools/alpha_diversity.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 import os, sys, argparse
 import math
 
diff --git a/DiversityTools/beta_diversity.py b/DiversityTools/beta_diversity.py
index 983326b..b9aadf1 100755
--- a/DiversityTools/beta_diversity.py
+++ b/DiversityTools/beta_diversity.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python
 ################################################################
 #bray_curtis.py takes multiple reports of classifications or
 #abundances and calculates a matrix of bray-curtis dissimilarity
diff --git a/combine_mpa.py b/combine_mpa.py
index 754562a..4da55e8 100755
--- a/combine_mpa.py
+++ b/combine_mpa.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python
 ####################################################################
 #combine_mpa.py converts multiple outputs from kreport2mpa.py
 #Copyright (C) 2020 Jennifer Lu, jennifer.lu717@gmail.com
diff --git a/kreport2mpa.py b/kreport2mpa.py
index 516ce8b..b6b1efb 100755
--- a/kreport2mpa.py
+++ b/kreport2mpa.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#!/usr/bin/env python
 ####################################################################
 #kreport2mpa.py converts a Kraken-style report into mpa [MetaPhlAn) format
 #Copyright (C) 2017-2020 Jennifer Lu, jennifer.lu717@gmail.com