diff --git a/tox.ini b/tox.ini
index ca9f183cf0f..4a58263588e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -105,7 +105,7 @@ commands = {posargs}
 
 [testenv:docs]
 commands =
-  rm -fr doc/source/contributor/api/ .autogenerated
+  rm -fr doc/build doc/source/contributor/api/ .autogenerated
   python setup.py build_sphinx
   rm -rf api-ref/build
   sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html/