diff --git a/lib/tempest b/lib/tempest
index 8455aae..b90988d 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -267,6 +267,7 @@
     iniset $TEMPEST_CONFIG identity admin_username $ADMIN_USERNAME
     iniset $TEMPEST_CONFIG identity admin_password "$password"
     iniset $TEMPEST_CONFIG identity admin_tenant_name $ADMIN_TENANT_NAME
+    iniset $TEMPEST_CONFIG identity auth_version ${TEMPEST_AUTH_VERSION:-v2}
 
     # Image
     # for the gate we want to be able to override this variable so we aren't