diff --git a/tox.ini b/tox.ini
index 0387607..a026ea9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ deps =
 extras = test
 commands =
 # Capturing output will fail on pypy, possibly due to this issue: https://github.com/pytest-dev/pytest/issues/5502
-    pytest {posargs:--color=yes --capture=no --cov=flow --cov-report=term-missing -v tests}
+    pytest --basetemp="{envtmpdir}" {posargs:--color=yes --capture=no --cov=flow --cov-report=term-missing -v tests}
     coverage report
     coverage xml