diff --git a/tox.ini b/tox.ini
index b47a6c94ac8..441960fbbf5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,6 +2,7 @@
 envlist = py39, lint, pylint, typing, cov
 skip_missing_interpreters = True
 ignore_basepython_conflict = True
+isolated_build = True
 
 [testenv]
 basepython = {env:PYTHON3_PATH:python3}