diff --git a/tests/topotests/lib/fe_client.py b/tests/topotests/lib/fe_client.py
index 07059ccf3a86..a47544633ba6 100755
--- a/tests/topotests/lib/fe_client.py
+++ b/tests/topotests/lib/fe_client.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 eval: (blacken-mode 1) -*-
 # SPDX-License-Identifier: GPL-2.0-or-later
 #