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/thread_msg_block_w_queue/Makefile b/tests/thread_msg_block_w_queue/Makefile
index fbc64266e3c5ffd480cdfb22297447c082f2f2a3..59ff51cb575fb70ea8304001c8a23cda41e88bd0 100644
--- a/tests/thread_msg_block_w_queue/Makefile
+++ b/tests/thread_msg_block_w_queue/Makefile
@@ -7,6 +7,4 @@ DISABLE_MODULE += auto_init
 include $(RIOTBASE)/Makefile.include
 
 test:
-# `testrunner` calls `make term` recursively, results in duplicated `TERMFLAGS`.
-# So clears `TERMFLAGS` before run.
-	TERMFLAGS= tests/01-run.py
+	tests/01-run.py
diff --git a/tests/thread_msg_block_wo_queue/Makefile b/tests/thread_msg_block_wo_queue/Makefile
index fbc64266e3c5ffd480cdfb22297447c082f2f2a3..59ff51cb575fb70ea8304001c8a23cda41e88bd0 100644
--- a/tests/thread_msg_block_wo_queue/Makefile
+++ b/tests/thread_msg_block_wo_queue/Makefile
@@ -7,6 +7,4 @@ DISABLE_MODULE += auto_init
 include $(RIOTBASE)/Makefile.include
 
 test:
-# `testrunner` calls `make term` recursively, results in duplicated `TERMFLAGS`.
-# So clears `TERMFLAGS` before run.
-	TERMFLAGS= tests/01-run.py
+	tests/01-run.py
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>
 #