diff --git a/setup.cfg b/setup.cfg
index cadbe72df9..3bd484ce97 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -696,9 +696,10 @@ autodoc_tree_excludes =
     openstackclient/tests/*
 
 [build_sphinx]
+all-files = 1
+warning-is-error = 1
 source-dir = doc/source
 build-dir = doc/build
-all_files = 1
 
 [upload_sphinx]
 upload-dir = doc/build/html