diff --git a/mailman_sync.py b/mailman_sync.py
index 39c1747..9625cd4 100755
--- a/mailman_sync.py
+++ b/mailman_sync.py
@@ -146,7 +146,7 @@ def main(
     for name, props in expected_lists.items():
         list_name = name + list_suffix
         list_manager = ListManager(mailman_bin, list_name, dry_run)
-        if list_name not in existing_lists:
+        if list_name.lower() not in existing_lists:
             if dry_run:
                 print(f"Skipping non-existing list {list_name} in dry run mode")
                 continue