diff --git a/tox.ini b/tox.ini
index 217801fa..fa35a846 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,6 +35,7 @@ commands = python setup.py build_sphinx
 
 [testenv:releasenotes]
 commands =
+  rm -rf releasenotes/build
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:debug]