diff --git a/tox.ini b/tox.ini
index 9d47907eca..da3ebf1b35 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,6 +15,12 @@ deps = -r{toxinidir}/requirements.txt
 commands =
   python -m neutron.openstack.common.lockutils python setup.py testr --slowest --testr-args='{posargs}'
 
+[testenv:hashtest]
+# This is the same as default environment, but with a random PYTHONHASHSEED.
+# You can also specify a specific hashseed (for test repeatability) as follows:
+#   tox --hashseed 1235130571 -e hashtest
+setenv = VIRTUAL_ENV={envdir}
+
 [testenv:functional]
 setenv = OS_TEST_PATH=./neutron/tests/functional
 commands =