diff --git a/setup.cfg b/setup.cfg
index 2577bed..6aea994 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -26,6 +26,7 @@ packages =
 source-dir = doc/source
 build-dir = doc/build
 all_files = 1
+warning-is-error = 1
 
 [upload_sphinx]
 upload-dir = doc/build/html