diff --git a/playbooks/kayobe-overcloud-base/overrides.yml.j2 b/playbooks/kayobe-overcloud-base/overrides.yml.j2
index 58ce039acb12003b298803fa91b784060c6aad50..58462fb525a1e255652f44d1999826ee39b0f375 100644
--- a/playbooks/kayobe-overcloud-base/overrides.yml.j2
+++ b/playbooks/kayobe-overcloud-base/overrides.yml.j2
@@ -47,4 +47,9 @@ kolla_enable_tls_internal: "yes"
 
 kolla_ironic_pxe_append_params_extra:
   - ipa-insecure=1
+
+# When TLS is enabled, extra RAM usage is causing the OOM killer to terminate
+# Tenks VMs. Disable Heat and Horizon to free up enough memory.
+kolla_enable_heat: false
+kolla_enable_horizon: false
 {% endif %}