diff --git a/setup.cfg b/setup.cfg
index b7347dd..2dfa8a7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -23,12 +23,12 @@ packages =
 source-dir = doc/source
 build-dir = doc/build
 all_files = 1
+warning-is-error = 1
 
 [upload_sphinx]
 upload-dir = doc/build/html
 
 [pbr]
-warnerrors = True
 autodoc_tree_index_modules = True
 autodoc_tree_excludes =
   setup.py