diff --git a/tox.ini b/tox.ini
index 6c8c1eb3fc..45851cfcfc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,6 +10,8 @@ install_command = pip install -U {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
+          OS_STDOUT_CAPTURE OS_STDERR_CAPTURE OS_LOG_CAPTURE OS_TEST_TIMEOUT
+          PYTHON OS_TEST_PATH LISTOPT IDOPTION
 commands =
   find . -type f -name "*.pyc" -delete
   python setup.py test --slowest --testr-args='{posargs}'