diff --git a/tasks/main.yml b/tasks/main.yml
index cb71c08..6e86784 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -336,7 +336,7 @@
       Domains: "{{ container_domain }}"
     systemd_networks: |-
       {% set _networks = [] %}
-      {% for _, value in (container_networks | combine(nspawn_networks)).items() %}
+      {% for _, value in nspawn_combined_networks.items() %}
       {%   if value.bridge is defined %}
       {%     set _network = {'interface': 'mv-mv-' + value.bridge.split('br-')[-1]} %}
       {%   else %}
diff --git a/templates/container_config.nspawn.j2 b/templates/container_config.nspawn.j2
index c118b19..180db65 100644
--- a/templates/container_config.nspawn.j2
+++ b/templates/container_config.nspawn.j2
@@ -24,8 +24,7 @@ Bind={{ bind }}:{{ bind }}
 
 [Network]
 {% set macvlans = [] %}
-{% set _ = container_networks.update(nspawn_networks) %}
-{% for key, value in container_networks.items() %}
+{% for key, value in nspawn_combined_networks.items() %}
 {%   if value.bridge is defined %}
 {%     set _ = macvlans.append('mv-' + value.bridge.split('br-')[-1]) %}
 {%   endif %}
diff --git a/templates/container_config_old.nspawn.j2 b/templates/container_config_old.nspawn.j2
index 4b87edb..0e8f4ee 100644
--- a/templates/container_config_old.nspawn.j2
+++ b/templates/container_config_old.nspawn.j2
@@ -18,8 +18,7 @@
 {%   endfor %}
 {% endif %}
 {% set macvlans = [] %}
-{% set _ = container_networks.update(nspawn_networks) %}
-{% for key, value in container_networks.items() %}
+{% for key, value in nspawn_combined_networks.items() %}
 {%   if value.bridge is defined %}
 {%     set macvlan = 'mv-' + value.bridge.split('br-')[-1] %}
 {%   endif %}
diff --git a/vars/main.yml b/vars/main.yml
new file mode 100644
index 0000000..ed14564
--- /dev/null
+++ b/vars/main.yml
@@ -0,0 +1,17 @@
+---
+# Copyright 2018, Rackspace US, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# A combined hash of all networks to be used within a deployment.
+nspawn_combined_networks: "{{ container_networks | combine(container_extra_networks | default({})) | combine(nspawn_networks) }}"