diff --git a/ungleich_pay.py b/ungleich_pay.py
index 64ee68c..d800433 100644
--- a/ungleich_pay.py
+++ b/ungleich_pay.py
@@ -12,20 +12,20 @@ class ungleichPay(object):
             'customers-list',
             help="List customers who have an active VM at ungleich",
             parents=[parents])
-        self.parser['username'].add_argument('--username', required=True)
-        self.parser['realm'].add_argument('--realm', required=True)
-        self.parser['token'].add_argument(
+        self.parser['customers-list'].add_argument('--username', required=True)
+        self.parser['customers-list'].add_argument('--realm', required=True)
+        self.parser['customers-list'].add_argument(
             '--token', required=True,
             help="A valid token obtained from ungleich"
         )
-        self.parser['ungleich_pay_server'].add_argument(
+        self.parser['customers-list'].add_argument(
             '--ungleich-pay-server', required=False,
             help="A valid ungleich pay server url"
         )
         self.parser['customers-list'].set_defaults(func=self.customers_list)
 
     def customers_list(self, args):
-        customers_list_endpoint = "/customers-list"
+        customers_list_endpoint = "/customers-list/"
         if args.ungleich_pay_server:
             request_url = args.ungleich_pay_server + customers_list_endpoint
         else: