diff --git a/source/main.py b/source/main.py
index ff50521..2e3656c 100644
--- a/source/main.py
+++ b/source/main.py
@@ -122,9 +122,11 @@ def main(
 		)
 		# print(_json.dumps(result, indent = "\t"))
 	elif (arguments.action == "certbot-hook"):
-		domain_full_parts = _os.environ["CERTBOT_DOMAIN"].split(".", 1)
-		domain = domain_full_parts[1]
-		name = (arguments.challenge_prefix + "." + domain_full_parts[0])
+		domain_full_parts = _os.environ["CERTBOT_DOMAIN"].split(".")
+		account = ".".join(domain_full_parts[-2:])
+		concern = ".".join(domain_full_parts[:-2])
+		domain = account
+		name = (arguments.challenge_prefix + "." + concern)
 		type_ = "TXT"
 		content = _os.environ["CERTBOT_VALIDATION"]
 		api_macro_save(