diff --git a/src/ifcbimtester/bimtester.py b/src/ifcbimtester/bimtester.py
old mode 100644
new mode 100755
index 88c063e646..95f69fc1d5
--- a/src/ifcbimtester/bimtester.py
+++ b/src/ifcbimtester/bimtester.py
@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 # Unix:
 # $ pyinstaller --onefile --clean --icon=icon.ico --add-data "features:features" bimtester.py`
 # Windows:
diff --git a/src/ifcblenderexport/occ_utils.py b/src/ifcblenderexport/occ_utils.py
old mode 100644
new mode 100755
index 6087caa3bc..fef07c11c5
--- a/src/ifcblenderexport/occ_utils.py
+++ b/src/ifcblenderexport/occ_utils.py
@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 ###############################################################################
 #                                                                             #
 # This file is part of IfcOpenShell.                                          #
diff --git a/src/ifcclash/collision.py b/src/ifcclash/collision.py
old mode 100644
new mode 100755
index 6bc841624a..1832ddcb08
--- a/src/ifcclash/collision.py
+++ b/src/ifcclash/collision.py
@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 # This code is taken from the trimesh project at https://github.com/mikedh/trimesh/blob/master/trimesh/collision.py
 # License MIT https://github.com/mikedh/trimesh/blob/master/LICENSE.md
 
diff --git a/src/ifcclash/ifcclash.py b/src/ifcclash/ifcclash.py
index 19929db908..156a519758 100755
--- a/src/ifcclash/ifcclash.py
+++ b/src/ifcclash/ifcclash.py
@@ -1,4 +1,4 @@
-#!python
+#!/usr/bin/python3
 
 import collision
 import ifcopenshell
diff --git a/src/ifccobie/cobie.py b/src/ifccobie/cobie.py
old mode 100644
new mode 100755
index dfb2032eb0..2851513368
--- a/src/ifccobie/cobie.py
+++ b/src/ifccobie/cobie.py
@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 # This can be packaged with `pyinstaller --onefile --clean --icon=icon.ico bimtester.py`
 
 import os
diff --git a/src/ifccsv/ifccsv.py b/src/ifccsv/ifccsv.py
old mode 100644
new mode 100755
index 6d28a4f218..ef60392347
--- a/src/ifccsv/ifccsv.py
+++ b/src/ifccsv/ifccsv.py
@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 # This can be packaged with `pyinstaller --onefile --clean --icon=icon.ico ifccsv.py`
 
 import ifcopenshell
diff --git a/src/ifcdiff/ifcdiff.py b/src/ifcdiff/ifcdiff.py
old mode 100644
new mode 100755
index 59bb30fa30..be3ac41d4f
--- a/src/ifcdiff/ifcdiff.py
+++ b/src/ifcdiff/ifcdiff.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 # This can be packaged with `pyinstaller --onefile --clean --icon=icon.ico ifcdiff.py`
 
 import ifcopenshell