diff --git a/tox.ini b/tox.ini
index 17b9b0c..9fc90d9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,8 +24,7 @@ commands =
 
 [testenv:build_docs]
 description = invoke sphinx-build to build the HTML docs
-change_dir =
-    docs
+change_dir = docs
 deps =
     sphinx
 commands =