diff --git a/tox.ini b/tox.ini
index 48cc4f4..20a1e73 100644
--- a/tox.ini
+++ b/tox.ini
@@ -46,3 +46,11 @@ exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build
 [hacking]
 import_exceptions =
   oslo_concurrency._i18n
+
+[testenv:pip-missing-reqs]
+# do not install test-requirements as that will pollute the virtualenv for
+# determining missing packages
+# this also means that pip-missing-reqs must be installed separately, outside
+# of the requirements.txt files
+deps = pip_missing_reqs
+commands = pip-missing-reqs -d --ignore-module=oslo_concurrency* --ignore-file=oslo_concurrency/tests/* --ignore-file=tests/ oslo_concurrency