diff --git a/setup.cfg b/setup.cfg
index f8e4990..989254e 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -82,6 +82,7 @@ oslo.config.opts.defaults =
 all_files = 1
 build-dir = doc/build
 source-dir = doc/source
+warning-is-error = 1
 
 [extract_messages]
 keywords = _ gettext ngettext l_ lazy_gettext