diff --git a/tox.ini b/tox.ini
index a81d40af..437eb05b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,3 +22,6 @@ commands = {toxinidir}/run_tests.sh --no-path-adjustment --with-coverage --cover
 [testenv:pep8]
 deps = pep8==1.1
 commands = pep8 --repeat --show-source ceilometer setup.py bin/ceilometer-agent-central bin/ceilometer-agent-compute bin/ceilometer-collector bin/ceilometer-api tests
+
+[testenv:venv]
+commands = {posargs}