diff --git a/tox.ini b/tox.ini
index 4465225f3d..ef12efc2fe 100644
--- a/tox.ini
+++ b/tox.ini
@@ -173,7 +173,7 @@ commands =
   bash -c "! find doc/ -type f -name *.json | xargs grep -U -n $'\r'"
   # Check that all included JSON files are valid JSON
   bash -c '! find doc/ -type f -name *.json | xargs -t -n1 python -m json.tool 2>&1 > /dev/null | grep -B1 -v ^python'
-  sphinx-build -W -b html doc/source doc/build/html
+  sphinx-build -W -b html -d doc/build/doctrees doc/source doc/build/html
   # Test the redirects. This must run after the main docs build
   whereto doc/build/html/.htaccess doc/test/redirect-tests.txt
   {[testenv:api-guide]commands}