diff --git a/hcloud/datacenters/domain.py b/hcloud/datacenters/domain.py
index 1c59bfa..05d5f79 100644
--- a/hcloud/datacenters/domain.py
+++ b/hcloud/datacenters/domain.py
@@ -36,7 +36,7 @@ def __init__(
         self.server_types = server_types
 
 
-class DatacenterServerTypes:
+class DatacenterServerTypes(BaseDomain):
     """DatacenterServerTypes Domain
 
     :param available: List[:class:`BoundServerTypes <hcloud.server_types.client.BoundServerTypes>`]
diff --git a/hcloud/firewalls/domain.py b/hcloud/firewalls/domain.py
index 192e649..2937282 100644
--- a/hcloud/firewalls/domain.py
+++ b/hcloud/firewalls/domain.py
@@ -48,7 +48,7 @@ def __init__(
         self.created = isoparse(created) if created else None
 
 
-class FirewallRule:
+class FirewallRule(BaseDomain):
     """Firewall Rule Domain
 
     :param direction: str
@@ -122,7 +122,7 @@ def to_payload(self):
         return payload
 
 
-class FirewallResource:
+class FirewallResource(BaseDomain):
     """Firewall Used By Domain
 
     :param type: str