diff --git a/tox.ini b/tox.ini
index 00f6515..ec3165f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -46,3 +46,11 @@ exclude = .tox,dist,doc,*.egg,build
 
 [testenv:benchmark]
 commands = python benchmark/benchmark.py
+
+[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_rootwrap* --ignore-module=pkg_resources --ignore-file=oslo_rootwrap/test.py --ignore-file=oslo_rootwrap/tests/* oslo_rootwrap
\ No newline at end of file