diff --git a/tox.ini b/tox.ini
index 57218a8..effcd68 100644
--- a/tox.ini
+++ b/tox.ini
@@ -9,7 +9,7 @@ basepython = python3
 setenv =
     VIRTUAL_ENV={envdir}
 deps =
-     -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
+     -c{env:TOX_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
      -r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
@@ -25,7 +25,7 @@ commands = python setup.py test --coverage --testr-args='{posargs}'
 
 [testenv:docs]
 deps =
-    -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
+    -c{env:TOX_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
     -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -W -b html -d doc/build/doctrees doc/source doc/build/html