diff --git a/sklearn/_build_utils/version.py b/sklearn/_build_utils/version.py
index 49a3cfb82bebd..124c6cc3a0cdc 100644
--- a/sklearn/_build_utils/version.py
+++ b/sklearn/_build_utils/version.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """Extract version number from __init__.py"""
 
 import os