diff --git a/Doc/conf.py b/Doc/conf.py
index eab3c39..da8b9d7 100644
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -46,6 +46,8 @@
     'languages': ['ja', 'fr', 'zh_TW', 'zh_CN'], 'builders': ['man', 'text'],
 }
 
+# Avoid a warning with Sphinx >= 2.0
+master_doc = 'contents'
 
 # Options for HTML output
 # -----------------------
diff --git a/Misc/NEWS.d/next/Documentation/2018-12-22-22-52-05.bpo-35564.TuEU_D.rst b/Misc/NEWS.d/next/Documentation/2018-12-22-22-52-05.bpo-35564.TuEU_D.rst
new file mode 100644
index 0000000..8ca95ee
--- /dev/null
+++ b/Misc/NEWS.d/next/Documentation/2018-12-22-22-52-05.bpo-35564.TuEU_D.rst
@@ -0,0 +1 @@
+Explicitly set master_doc variable in conf.py for compliance with Sphinx 2.0