diff --git a/tox.ini b/tox.ini
index 88d1302..b44d715 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,6 +13,13 @@
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
          OS_TEST_PATH=./tempest/tests
+passenv = OS_STDOUT_CAPTURE
+          OS_STDERR_CAPTURE
+          OS_TEST_TIMEOUT
+          OS_TEST_LOCK_PATH
+          OS_TEST_PATH
+          TEMPEST_CONFIG
+          TEMPEST_CONFIG_DIR
 usedevelop = True
 install_command = pip install -U {opts} {packages}
 whitelist_externals = *