diff --git a/tox.ini b/tox.ini
index 73eb1073..95dda36f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@ minversion = 2.0
 envlist = py35,py27,pep8,pip-missing-reqs
 
 [testenv]
-install_command = {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+install_command = {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/pike} {opts} {packages}
 whitelist_externals = bash
                       env
 setenv =