diff --git a/zuul.yaml b/zuul.yaml
index ec124be01..5dcea48d4 100644
--- a/zuul.yaml
+++ b/zuul.yaml
@@ -236,7 +236,7 @@
          libraries.
 
       .. zuul:jobvar:: sphinx_python
-          :default: python2
+         :default: python2
 
          Version of python to use, either ``python2`` or ``python3``.