diff --git a/tox.ini b/tox.ini
index bf19fc7dad..7889f57579 100644
--- a/tox.ini
+++ b/tox.ini
@@ -83,7 +83,7 @@ setenv =
   ANSIBLE_ACTION_PLUGINS = {toxinidir}/ansible/action_plugins
   ANSIBLE_FILTER_PLUGINS = {toxinidir}/ansible/filter_plugins
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/test-requirements.txt
   -r{toxinidir}/doc/requirements.txt
 whitelist_externals = bash