diff --git a/.readthedocs.yml b/.readthedocs.yml
index 94ad679ce4..4b829fc279 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -12,5 +12,3 @@ build:
     - inkscape
 sphinx:
   configuration: doc/conf.py
-formats:
-  - pdf