diff --git a/testing/trackTri01.py b/testing/trackTri01.py
old mode 100644
new mode 100755
index 58c1529..94d0a13
--- a/testing/trackTri01.py
+++ b/testing/trackTri01.py
@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 #=============================== trackTri01 ==============================
 #
 # @brief    Code to create an image sequence of a rigid body moving along a
diff --git a/testing/trackTri02.py b/testing/trackTri02.py
old mode 100644
new mode 100755
index 497186b..d6f773d
--- a/testing/trackTri02.py
+++ b/testing/trackTri02.py
@@ -1,3 +1,4 @@
+#!/usr/bin/python3
 #=============================== trackTri02 ==============================
 #
 # @brief    Code to create an image sequence of multiple objects moving along a