diff --git a/build.py b/build.py
index bda68969c..7d2fadfed 100644
--- a/build.py
+++ b/build.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 ''' this module is used to build whitebox-tools.
 '''
 import os
diff --git a/lib_test.py b/lib_test.py
index 2bc99bf3c..ab58f38e6 100644
--- a/lib_test.py
+++ b/lib_test.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 ''' This script is intended to experiment with the use of a whitebox_tools shared library (DLL).
 It is experimental and is not intended for widespread use.
 '''
diff --git a/wb_runner.py b/wb_runner.py
index 5adb95168..0f113ff91 100644
--- a/wb_runner.py
+++ b/wb_runner.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 
 # This script is part of the WhiteboxTools geospatial analysis library.
 # Authors: Dr. John Lindsay
diff --git a/whitebox_example.py b/whitebox_example.py
index f959c646e..7f32fc81a 100644
--- a/whitebox_example.py
+++ b/whitebox_example.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 ''' This module provides examples of how to call the whitebox_tool script and the
 whitebox-tools geospatial analysis library using Python code.
 '''
diff --git a/whitebox_plugin_generator.py b/whitebox_plugin_generator.py
index f3a480e1a..a75f9fecb 100644
--- a/whitebox_plugin_generator.py
+++ b/whitebox_plugin_generator.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """
 This script is just used to automatically generate the convenience methods for each
 of the plugin tools in the whitebox_tools.py script. It should be run each time new
diff --git a/whitebox_tools.py b/whitebox_tools.py
index 8e08c1a0a..3dc128c1a 100644
--- a/whitebox_tools.py
+++ b/whitebox_tools.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 ''' This file is intended to be a helper for running whitebox-tools plugins from a Python script.
 See whitebox_example.py for an example of how to use it.
 '''