diff --git a/tox.ini b/tox.ini
index 98cf3871dce9b25880dc0cdd044f3d18b31fb7ea..0b0cdd26135abca6c2e42ec3d25c635c7a705a04 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,7 +13,7 @@ setenv =
    OS_STDOUT_CAPTURE=1
    OS_STDERR_CAPTURE=1
 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}/requirements.txt
 commands = stestr run --slowest {posargs}