diff --git a/savannaclient/api/cluster_templates.py b/savannaclient/api/cluster_templates.py
index c18de320..dcf73b01 100644
--- a/savannaclient/api/cluster_templates.py
+++ b/savannaclient/api/cluster_templates.py
@@ -33,7 +33,7 @@ class ClusterTemplateManager(base.ResourceManager):
             'hadoop_version': hadoop_version,
             'description': description,
             'cluster_configs': cluster_configs,
-            'node_groups': [ng.as_dict() for ng in node_groups],
+            'node_groups': node_groups,
             'anti_affinity': anti_affinity
         }
 
diff --git a/savannaclient/api/clusters.py b/savannaclient/api/clusters.py
index 02455607..564dc69b 100644
--- a/savannaclient/api/clusters.py
+++ b/savannaclient/api/clusters.py
@@ -41,9 +41,6 @@ class ClusterManager(base.ResourceManager):
                description=None, cluster_configs=None, node_groups=None,
                user_keypair_id=None, anti_affinity=None, net_id=None):
 
-        if node_groups is not None:
-            node_groups = [ng.as_dict() for ng in node_groups]
-
         data = {
             'name': name,
             'plugin_name': plugin_name,