diff --git a/examples/rosen.py b/examples/rosen.py
index 1d895b05..10629911 100644
--- a/examples/rosen.py
+++ b/examples/rosen.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python
 from scipy.optimize import rosen, rosen_der
 from cyipopt import minimize_ipopt
 x0 = [1.3, 0.7, 0.8, 1.9, 1.2]