diff --git a/doc/conf.py b/doc/conf.py
index 096af48c82..50d891eb93 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -106,8 +106,8 @@
 # The encoding of source files.
 # source_encoding = 'utf-8-sig'
 
-# The master toctree document.
-master_doc = "index"
+# The root toctree document.
+root_doc = "index"
 
 # General information about the project.
 project = "Pylint"