diff --git a/tox.ini b/tox.ini
index 4fbea41e..80880a48 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,6 @@ usedevelop = True
 install_command = pip install {opts} {packages}
 whitelist_externals =
     find
-    flake8
     rm
 commands =
     find . -type f -name "*.pyc" -delete
@@ -45,7 +44,9 @@ commands =
 [testenv:releasenotes]
 basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt
-commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
+commands =
+  rm -rf releasenotes/build
+  sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:pep8]
 basepython = python3