diff --git a/environments/undercloud.yaml b/environments/undercloud.yaml
index 1de7e401ad..d56d90638c 100644
--- a/environments/undercloud.yaml
+++ b/environments/undercloud.yaml
@@ -108,6 +108,7 @@ parameter_defaults:
   HeatMaxJsonBodySize: 4194304
   HeatReauthenticationAuthMethod: 'trusts'
   HeatYaqlLimitIterators: 10000
+  HeatYaqlMemoryQuota: 200000
   # Disable non-lifecycle stack actions like
   # snapshot, resume, cancel update and stack check.
   HeatApiPolicies: