diff --git a/certbot_dns_hetzner/dns_hetzner.py b/certbot_dns_hetzner/dns_hetzner.py
index 2a9abea..811277e 100644
--- a/certbot_dns_hetzner/dns_hetzner.py
+++ b/certbot_dns_hetzner/dns_hetzner.py
@@ -44,7 +44,8 @@ def _setup_credentials(self):
 
     @staticmethod
     def _get_zone(domain):
-        zone_name = tldextract.extract(domain)
+        extract = tldextract.TLDExtract()
+        zone_name = extract(domain, include_psl_private_domains=True)
         return '.'.join([zone_name.domain, zone_name.suffix])
 
     def _perform(self, domain, validation_name, validation):