diff --git a/doc/conf.py b/doc/conf.py
index acddfeb09..b4fb47add 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -27,6 +27,7 @@ version = '4.9-dev'
 # The full version, including alpha/beta/rc tags
 release = '4.9-dev'
 
+master_doc = 'index'
 
 # -- General configuration ---------------------------------------------------