diff --git a/tox.ini b/tox.ini
index 370cb7e56..319c97af7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -47,6 +47,7 @@ commands =
   rm -rf api-ref/build
   sphinx-build -W -b linkcheck api-ref/source api-ref/build/linkcheck
   rm -rf doc/build
+  python setup.py build_sphinx
   sphinx-build -W -b linkcheck doc/source doc/build/linkcheck
 
 [testenv:debug]