diff --git a/tripleoclient/config/standalone.py b/tripleoclient/config/standalone.py
index 50c74ebb2..29d28789a 100644
--- a/tripleoclient/config/standalone.py
+++ b/tripleoclient/config/standalone.py
@@ -132,7 +132,7 @@ class StandaloneConfig(BaseConfig):
                        help=_(
                            'Path to network config override template. '
                            'Relative paths get computed inside of $HOME. '
-                           'Must be in the json format. '
+                           'Must be in the json or yaml format. '
                            'Its content overrides anything in t-h-t '
                            '<role>NetConfigOverride. The processed '
                            'template is then passed in Heat via the '
diff --git a/tripleoclient/v1/undercloud_config.py b/tripleoclient/v1/undercloud_config.py
index 6de613891..640a1ea1e 100644
--- a/tripleoclient/v1/undercloud_config.py
+++ b/tripleoclient/v1/undercloud_config.py
@@ -15,12 +15,12 @@
 
 """Plugin action implementation"""
 
-import json
 import logging
 import netaddr
 import os
 import shutil
 import sys
+import yaml
 
 from cryptography import x509
 
@@ -794,9 +794,9 @@ def prepare_undercloud_deploy(upgrade=False, no_validations=True,
             os.path.split(data_file)[-1]).render(context).replace(
                 "'", '"').replace('&quot;', '"')
         try:
-            net_config_json = json.loads(net_config_str)
+            net_config_json = yaml.safe_load(net_config_str)
         except ValueError:
-            net_config_json = json.loads("{%s}" % net_config_str)
+            net_config_json = yaml.safe_load("{%s}" % net_config_str)
 
         if 'network_config' not in net_config_json:
             msg = ('Unsupported data format in net_config_override '