diff --git a/.readthedocs.yml b/.readthedocs.yml
index 50b9b384..593793c2 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,7 +6,8 @@ build:
     python: "3.8"
 
 sphinx:
-   configuration: docs/conf.py
+  configuration: docs/conf.py
+  fail_on_warning: true
 
 python:
   install: