diff --git a/gestion/gen_confs/adherents.py b/gestion/gen_confs/adherents.py
index eff34bde..df6bd180 100644
--- a/gestion/gen_confs/adherents.py
+++ b/gestion/gen_confs/adherents.py
@@ -157,7 +157,7 @@ class mail_bienvenue:
                 To = mail
                 if To.find('@') == -1: To += '@crans.org'
                 conn=smtplib.SMTP('localhost')
-                conn.sendmail(From, To, config.txt_mail_bienvenue % { 'From': From, 'To': To })
+                conn.sendmail(From, To, config.txt_mail_bienvenue.encode('utf-8') % { 'From': From, 'To': To })
                 conn.quit()
                 print OK
             except Exception, c: