diff --git a/docs/web/howto/web-in-60/wsgi.rst b/docs/web/howto/web-in-60/wsgi.rst
index c20e60b3de2..8dd3962e13a 100644
--- a/docs/web/howto/web-in-60/wsgi.rst
+++ b/docs/web/howto/web-in-60/wsgi.rst
@@ -68,7 +68,7 @@ simple one just to get things going:
     
     def application(environ, start_response):
         start_response('200 OK', [('Content-type', 'text/plain')])
-        return ['Hello, world!']
+        return [b'Hello, world!']