diff --git a/tox.ini b/tox.ini
index 16c4de19..3f82c641 100644
--- a/tox.ini
+++ b/tox.ini
@@ -125,7 +125,7 @@ commands =
     # we build the change log as news entries might break
     # the README that is displayed on PyPI
     towncrier build --version=100.0.0 --yes
-    python -m build --sdist --no-isolation
+    python -m build --sdist
     twine check dist/*
 
 [testenv:circular]