diff --git a/tox.ini b/tox.ini
index f101e7a..4ff57e5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ setenv = VIRTUAL_ENV={envdir}
          PYTHONDONTWRITEBYTECODE=1
          DJANGO_SETTINGS_MODULE=designatedashboard.settings
 whitelist_externals = find
-deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt