diff --git a/tox.ini b/tox.ini
index a55a878e..94833952 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,7 @@ skipsdist = True
 [testenv]
 usedevelop = True
 install_command =
-    {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+    {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 = find
 setenv =
    VIRTUAL_ENV={envdir}