diff --git a/playbooks/kayobe-overcloud-upgrade-base/overrides.yml.j2 b/playbooks/kayobe-overcloud-upgrade-base/overrides.yml.j2
index ca6bac14b..5b19dc729 100644
--- a/playbooks/kayobe-overcloud-upgrade-base/overrides.yml.j2
+++ b/playbooks/kayobe-overcloud-upgrade-base/overrides.yml.j2
@@ -39,3 +39,6 @@ aio_bridge_ports:
 
 # Enable ironic for testing baremetal compute.
 kolla_enable_ironic: true
+
+# Disable heat to save disk space.
+kolla_enable_heat: false