diff --git a/files/acme-auth-loopia.py b/files/acme-auth-loopia.py
index 67f4b52..50a8957 100755
--- a/files/acme-auth-loopia.py
+++ b/files/acme-auth-loopia.py
@@ -69,12 +69,14 @@ def main():
         client = xmlrpc.client.ServerProxy(uri = url, encoding='utf-8')
 
 
+    parts=[]
     while domain:
         res = client.getSubdomains(user, pwd, domain)
         if 'UNKNOWN_ERROR' not in res:
             break
-        subdomain, domain = domain.split('.', maxsplit=1)
-        subdomain = '_acme-challenge.{}'.format(subdomain)
+        part, domain = domain.split('.', maxsplit=1)
+        parts.append(part)
+        subdomain = '_acme-challenge.{}'.format('.'.join(parts))
 
     if 'UNKNOWN_ERROR' in res:
         print("Failed to find domain in loopiadns")