diff --git a/environments/docker.yaml b/environments/docker.yaml
index be21d842b1..a7e2504cc7 100644
--- a/environments/docker.yaml
+++ b/environments/docker.yaml
@@ -3,7 +3,7 @@ resource_registry:
   OS::TripleO::ComputePostDeployment: ../docker/compute-post.yaml
   OS::TripleO::NodeUserData: ../docker/firstboot/install_docker_agents.yaml
 
-parameters:
+parameter_defaults:
   NovaImage: atomic-image
 
 parameter_defaults:
diff --git a/environments/manage-firewall.yaml b/environments/manage-firewall.yaml
index 071f4108bd..5d48698e16 100644
--- a/environments/manage-firewall.yaml
+++ b/environments/manage-firewall.yaml
@@ -1,2 +1,2 @@
-parameters:
+parameter_defaults:
   ManageFirewall: true
diff --git a/environments/mongodb-nojournal.yaml b/environments/mongodb-nojournal.yaml
index 1e13e4521e..92cef5321b 100644
--- a/environments/mongodb-nojournal.yaml
+++ b/environments/mongodb-nojournal.yaml
@@ -1,5 +1,5 @@
 # A Heat environment file which can be used to disable journal in MongoDb.
 # Since, when journaling is enabled, MongoDb will create big journal file
 # it can take time. In a CI environment for example journaling is not necessary.
-parameters:
+parameter_defaults:
   MongoDbNoJournal: true
diff --git a/environments/puppet-ceph-devel.yaml b/environments/puppet-ceph-devel.yaml
index fb63af6531..a2d1100fda 100644
--- a/environments/puppet-ceph-devel.yaml
+++ b/environments/puppet-ceph-devel.yaml
@@ -1,7 +1,7 @@
 # A Heat environment file which can be used to enable a Ceph
 # storage cluster using the controller and ceph nodes.
 # Rbd backends are enabled for Cinder, Glance, Gnocchi and Nova.
-parameters:
+parameter_defaults:
   #NOTE: These ID's and keys should be regenerated for
   # a production deployment. What is here is suitable for
   # developer and CI testing only.
diff --git a/environments/puppet-tenant-vlan.yaml b/environments/puppet-tenant-vlan.yaml
index 0df63cafcf..ed948bc518 100644
--- a/environments/puppet-tenant-vlan.yaml
+++ b/environments/puppet-tenant-vlan.yaml
@@ -1,4 +1,4 @@
-parameters:
+parameter_defaults:
   NeutronNetworkType: vlan
   NeutronEnableTunnelling: false
-  NeutronNetworkVLANRanges: datacentre:1:1000
\ No newline at end of file
+  NeutronNetworkVLANRanges: datacentre:1:1000
diff --git a/environments/updates/update-from-keystone-admin-internal-api.yaml b/environments/updates/update-from-keystone-admin-internal-api.yaml
index 3c71ef1bc4..a9fa2bea4e 100644
--- a/environments/updates/update-from-keystone-admin-internal-api.yaml
+++ b/environments/updates/update-from-keystone-admin-internal-api.yaml
@@ -1,7 +1,7 @@
 # This environment file provides a default value for ServiceNetMap where
 # Keystone Admin API service is running on the Internal API network
 
-parameters:
+parameter_defaults:
   ServiceNetMap:
     NeutronTenantNetwork: tenant
     CeilometerApiNetwork: internal_api