diff --git a/tests/lwip/tests/01-run.py b/tests/lwip/tests/01-run.py
index 652455ccff123aedbe836b7e7321e50f4eff62d2..6c7f62c8dad9d3a6ae3a1b0b57bf8e6aab3cd2e6 100755
--- a/tests/lwip/tests/01-run.py
+++ b/tests/lwip/tests/01-run.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python3
 # -*- coding: utf-8 -*-
 # vim:fenc=utf-8
 #
diff --git a/tests/xtimer_usleep/tests/01-run.py b/tests/xtimer_usleep/tests/01-run.py
index 74ba91d31de97b832feed01864e5111e90cc79dc..1cc3f1757756e22626e461f09369ad1ba0895e6b 100755
--- a/tests/xtimer_usleep/tests/01-run.py
+++ b/tests/xtimer_usleep/tests/01-run.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # vim:fenc=utf-8
 
diff --git a/tests/xtimer_usleep_short/tests/01-run.py b/tests/xtimer_usleep_short/tests/01-run.py
index 815c166e0d9a32ec98b9ee4206176df2f3395417..d242289512f1ade6011b537e34bb7200df543dde 100755
--- a/tests/xtimer_usleep_short/tests/01-run.py
+++ b/tests/xtimer_usleep_short/tests/01-run.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright (C) 2017 Michel Rottleuthner <michel.rottleuthner@haw-hamburg.de>
 #