diff --git a/inventory_plugins/netgo-hcloud.py b/inventory_plugins/netgo-hcloud.py
index 4cf104e..7c1b173 100644
--- a/inventory_plugins/netgo-hcloud.py
+++ b/inventory_plugins/netgo-hcloud.py
@@ -151,7 +151,7 @@ class InventoryModule(BaseInventoryPlugin, Constructable, Cacheable):
         # Add a default top group 'hcloud'
         self.inventory.add_group(group="hcloud")
         self.inventory.add_group(group="etcd")
-        self.inventory.add_group(group="k8s-cluster")
+        self.inventory.add_group(group="k8s_cluster")
 
         for server in servers:
             serverId = server["id"]
diff --git a/kubernetes.yml b/kubernetes.yml
index 45dfd08..5b7ab15 100644
--- a/kubernetes.yml
+++ b/kubernetes.yml
@@ -1,7 +1,7 @@
 ---
 
 - name: 'apply kubernetes setup to {{ host | default("all") }}'
-  hosts: '{{ host | default("k8s-cluster") }}'
+  hosts: '{{ host | default("k8s_cluster") }}'
   serial: "{{ serial_number | default(5) }}"
   become: yes