diff --git a/tox.ini b/tox.ini
index 40e231e4c..d33786812 100644
--- a/tox.ini
+++ b/tox.ini
@@ -42,7 +42,9 @@ deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
-commands = sphinx-build -W -b html doc/source doc/build/html
+commands =
+    rm -rf doc/build
+    sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:cover]
 commands =
@@ -121,7 +123,9 @@ deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
-commands = sphinx-build -a -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
+commands =
+    rm -rf releasenotes/build
+    sphinx-build -a -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:venv]
 commands = {posargs}