1 files changed, 2 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index cf70f49..a6529eb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,8 +1,10 @@
 [tox]
 envlist = py35,py36,py37,py38,py39
+isolated_build = True
 
 [testenv]
 deps= -rdev-requirements.txt
+whitelist_externals=mkdir
 commands=mkdir -p reports/{envname}
          coverage run --source jsonrpclib -m pytest --junitxml=reports/{envname}/test-results.xml tests.py
          coverage report