diff --git a/readthedocs.yml b/readthedocs.yml
index 88abb57ae43..072a4b5110c 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -7,6 +7,6 @@ conda:
     environment: ci/requirements/doc.yml
 
 sphinx:
-  fail_on_warning: false
+  fail_on_warning: true
 
 formats: []