diff --git a/readthedocs.yml b/readthedocs.yml
index 282e312e..d8321838 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -33,7 +33,7 @@ python:
       path: .
       extra_requirements: 
         - docs
-system_packages: true
+  system_packages: true
 
 sphinx:
   configuration: docs/conf.py