diff --git a/tox.ini b/tox.ini
index 492c4f6..5515d42 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,6 +8,8 @@
          OS_TEST_PATH=./tempest/test_discover
 usedevelop = True
 install_command = pip install -U {opts} {packages}
+whitelist_externals = bash
+
 
 [testenv:py26]
 setenv = OS_TEST_PATH=./tempest/tests