diff --git a/contrib/musig2-vectors.py b/contrib/musig2-vectors.py
index 8df3870f7..97424419f 100755
--- a/contrib/musig2-vectors.py
+++ b/contrib/musig2-vectors.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 import json