diff --git a/playbooks/legacy/neutron-grenade/run.yaml b/playbooks/legacy/neutron-grenade/run.yaml
index 9b26a9be162..6041e2041c6 100644
--- a/playbooks/legacy/neutron-grenade/run.yaml
+++ b/playbooks/legacy/neutron-grenade/run.yaml
@@ -43,6 +43,7 @@
           set -x
           export PROJECTS="openstack/grenade $PROJECTS"
           export PYTHONUNBUFFERED=true
+          export DEVSTACK_GATE_USE_PYTHON3=False
           export DEVSTACK_GATE_TEMPEST=1
           export DEVSTACK_GATE_GRENADE=pullup
           export DEVSTACK_GATE_NEUTRON=1