diff --git a/participate.py b/participate.py
index c64a7ea..0cebf17 100755
--- a/participate.py
+++ b/participate.py
@@ -759,7 +759,7 @@ def confirm_link(LINK_ID):
 def register():
   """ Allow self registration """
   try:
-    login = request.form.get('login').encode('utf-8')
+    login = request.form.get('login').lower().encode('utf-8')
     password = request.form.get('password').encode('utf-8')
     confirm = request.form.get('confirm').encode('utf-8')
     message = "Erreur lors de l'enregsitrement: L'utilisateur existe t-il déjà ?".decode('utf-8')