diff --git a/setup.cfg b/setup.cfg
index 65baeee..6a00c31 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -32,6 +32,7 @@ console_scripts =
 source-dir = doc/source
 build-dir = doc/build
 all_files = 1
+warning-is-error = 1
 
 [upload_sphinx]
 upload-dir = doc/build/html