diff --git a/mailman_sync.py b/mailman_sync.py
index 9bb679b..93786c4 100755
--- a/mailman_sync.py
+++ b/mailman_sync.py
@@ -48,7 +48,7 @@ def main(mailman_bin: Path, api: str, token: str, list_suffix: str):
     for name, members in certification_lists.items():
         list_name = name + list_suffix
         if list_name in existing_lists:
-            sync_members(mailman_bin, name, members)
+            sync_members(mailman_bin, list_name, members)
         else:
             print(f"Skipping {list_name}, as it does not exist in Mailman")