diff --git a/README.rst b/README.rst
index 4749b5f..07f8a8e 100644
--- a/README.rst
+++ b/README.rst
@@ -46,7 +46,7 @@ Check appliance files
 
 .. code:: bash
 
-    python check.py
+    python3 check.py
     python3 check_urls.py
 
 If `imagemagick` is installed, it will be used to check the symbol properties.
diff --git a/check.py b/check.py
index a68acba..a754dc1 100644
--- a/check.py
+++ b/check.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 # Copyright (C) 2015 GNS3 Technologies Inc.
 #
diff --git a/picture.py b/picture.py
index 3e9fd41..133f15e 100644
--- a/picture.py
+++ b/picture.py
@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+# -*- coding: utf-8 -*-
 #
 # Copyright (C) 2016 GNS3 Technologies Inc.
 #