diff --git a/app/scodoc/sco_bulletins.py b/app/scodoc/sco_bulletins.py
index 0a88f648..98f3a917 100644
--- a/app/scodoc/sco_bulletins.py
+++ b/app/scodoc/sco_bulletins.py
@@ -987,7 +987,7 @@ def mail_bulletin(formsemestre_id, I, pdfdata, filename, recipient_addr):
         bcc = copy_addr.strip()
     else:
         bcc = ""
-    msg = Message(subject, sender=sender, recipients=recipients, bcc=bcc)
+    msg = Message(subject, sender=sender, recipients=recipients, bcc=[bcc])
     msg.body = hea
 
     # Attach pdf