diff --git a/setup.cfg b/setup.cfg
index 6f69c2f..7c7ff61 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -30,12 +30,12 @@ scripts =
 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_index_modules = true
 
 [wheel]