diff --git a/src/bonsai/scripts/dev_environment.py b/src/bonsai/scripts/dev_environment.py
old mode 100644
new mode 100755
index e9a8d2a44f..fe6f46faca
--- a/src/bonsai/scripts/dev_environment.py
+++ b/src/bonsai/scripts/dev_environment.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """Setup Bonsai Development Environment.
 
 Script links existing Bonsai installation to the provided IfcOpenShell repository.
diff --git a/src/ifcopenshell-python/scripts/dev_environment.py b/src/ifcopenshell-python/scripts/dev_environment.py
old mode 100644
new mode 100755
index b958369ba1..59f78e8862
--- a/src/ifcopenshell-python/scripts/dev_environment.py
+++ b/src/ifcopenshell-python/scripts/dev_environment.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """Setup IfcOpenShell Development Environment.
 
 Scripts creates symlinks in current user's site-packages to the IfcOpenShell repository.