diff --git a/tox.ini b/tox.ini
index 9d2df7deebdc..8062febe6a75 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,10 +7,13 @@ skipsdist = True
 sitepackages = True
 usedevelop = True
 install_command = pip install -U {opts} {packages}
+# Note the hash seed is set to 0 until nova can be tested with a
+# random hash seed successfully.
 setenv = VIRTUAL_ENV={envdir}
          LANG=en_US.UTF-8
          LANGUAGE=en_US:en
          LC_ALL=C
+         PYTHONHASHSEED=0
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
@@ -28,13 +31,11 @@ commands =
   {toxinidir}/tools/config/check_uptodate.sh
 
 [testenv:pylint]
-setenv = VIRTUAL_ENV={envdir}
 commands = bash tools/lintstack.sh
 
 [testenv:cover]
 # Also do not run test_coverage_ext tests while gathering coverage as those
 # tests conflict with coverage.
-setenv = VIRTUAL_ENV={envdir}
 commands =
   python tools/patch_tox_venv.py
   python setup.py testr --coverage \