diff --git a/docs/tutorial/setup.rst b/docs/tutorial/setup.rst
index ed8a744c..65d4b3f2 100644
--- a/docs/tutorial/setup.rst
+++ b/docs/tutorial/setup.rst
@@ -14,6 +14,7 @@ load that or import the values from there.
 First we add the imports in `flaskr.py`::
 
     # all the imports
+    import os
     import sqlite3
     from flask import Flask, request, session, g, redirect, url_for, abort, \
          render_template, flash