diff --git a/docs/advanced.rst b/docs/advanced.rst
index 2aec2b13..77f940d2 100644
--- a/docs/advanced.rst
+++ b/docs/advanced.rst
@@ -47,6 +47,7 @@ settings:
 
 .. code-block:: python
 
+    import os
     import raven
 
     client = raven.Client(