diff --git a/doc/examples/lic_demo.py b/doc/examples/lic_demo.py
index 4beb25cf9..a0c8509d0 100755
--- a/doc/examples/lic_demo.py
+++ b/doc/examples/lic_demo.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from __future__ import (absolute_import, division, print_function)
 
 # example showing how to use Line Integral Convolution to visualize a vector
diff --git a/doc/examples/streamplot_demo.py b/doc/examples/streamplot_demo.py
index 3fc605b70..144bc21c6 100755
--- a/doc/examples/streamplot_demo.py
+++ b/doc/examples/streamplot_demo.py
@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 from __future__ import (absolute_import, division, print_function)
 
 # example showing how to use streamlines to visualize a vector