diff --git a/sync_adherents_mailman.py b/sync_adherents_mailman.py
index 5af986b..6047f42 100644
--- a/sync_adherents_mailman.py
+++ b/sync_adherents_mailman.py
@@ -20,7 +20,7 @@ if changed:
     for section in config.sections():
         if section not in ["Re2o", "Mailman"] and config.getboolean(section, 'activate'):
             list_name = config.get(section, "list_name", fallback=section)
-            response1 = requests.get(roster_url.format(mailman_url=mailman_url, list_namelist_name, domain=domain), auth=(mailman_username, mailman_password))
+            response1 = requests.get(roster_url.format(mailman_url=mailman_url, list_name=list_name, domain=domain), auth=(mailman_username, mailman_password))
             if "entries" in response1.json():
                 entries = response1.json()['entries']
                 old_emails = [entry['email'] for entry in entries]