diff --git a/bibcheck.py b/bibcheck.py
index 2289536..a575262 100644
--- a/bibcheck.py
+++ b/bibcheck.py
@@ -56,7 +56,7 @@ def check(username, password, notify_ids):
             delta = date - datetime.datetime.now()
             allinfo.append(str(info))
             if delta.days <= 10 or delta.days == 20 or delta.days == 15:
-                for client in itertools.join(notify_ids, os.environ['PUSHOVER_CLIENTS'].split(',')):
+                for client in itertools.chain(notify_ids, os.environ['PUSHOVER_CLIENTS'].split(',')):
                     pushover.Client(client).send_message(f'Bitte an {info[3]} denken, Abgabe {info[3]} - {username}', title="Erinnerung")
     except (StopIteration, mechanize._mechanize.LinkNotFoundError) as e:
         for client in itertools.join(notify_ids, os.environ['PUSHOVER_CLIENTS'].split(',')):