diff --git a/nyacme/hook.py b/nyacme/hook.py
index a0c1c93..b200f87 100644
--- a/nyacme/hook.py
+++ b/nyacme/hook.py
@@ -19,19 +19,21 @@ handlers = {
     'http': HTTPHandler,
 }
 
+class Args:
+    def __init__(self, argv):
+        # one of 'begin', 'done', 'failed'
+        self.method = argv[1]
+        # challenge type (dns-01, http-01 or tls-alpn-01)
+        self.type = argv[2]
+        # the identifier the challenge refers to (domain name)
+        self.domain = argv[3]
+        # the challenge token
+        self.token = argv[4]
+        # the key authorization (DNS record contents, etc.)
+        self.auth = argv[5]
 
 def main() -> None:
-    parser = argparse.ArgumentParser(
-        prog='nyacme-hook',
-        description='nyacme hook (not meant to be ran manually)'
-    )
-    parser.add_argument('method', help='one of begin, done or failed')
-    parser.add_argument('type', help='challenge type (dns-01, http-01 or tls-alpn-01)')
-    parser.add_argument('domain', help='the identifier the challenge refers to (domain name)')
-    parser.add_argument('token', help='the challenge token')
-    parser.add_argument('auth', help='the key authorization (DNS record contents, etc.)')
-    args = parser.parse_args()
-
+    args = Args(sys.argv)
     config = read_config(None)
 
     record_name = f'_acme-challenge.{args.domain}'