diff --git a/.readthedocs.yml b/.readthedocs.yml
index 56e053b5..a9a1a7b1 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,6 +1,7 @@
 version: 2
 
 sphinx:
+  builder: dirthml
   configuration: conf.py
 
 python: