diff --git a/lemarche/conversations/utils.py b/lemarche/conversations/utils.py
index 76c858532..23e338bde 100644
--- a/lemarche/conversations/utils.py
+++ b/lemarche/conversations/utils.py
@@ -18,6 +18,6 @@ def get_info_from_email_prefix(email_prefix: str) -> list:
         kind_sender = email_prefix_infos[1]
     else:  # version 1
         version = 1
-        uuid = email_prefix[-1]
+        uuid = email_prefix_infos[-1]
         kind_sender = None  # not useful
     return version, uuid, kind_sender