diff --git a/canaille/account.py b/canaille/account.py
index 39a512b6..3b78e619 100644
--- a/canaille/account.py
+++ b/canaille/account.py
@@ -58,6 +58,7 @@ def profile(user):
         for k, v in claims.items()
     }
     form = ProfileForm(request.form or None, data=data)
+    form.sub.render_kw["readonly"] = "true"
 
     if request.form:
         if not form.validate():
diff --git a/canaille/forms.py b/canaille/forms.py
index 65106b51..5c5dca69 100644
--- a/canaille/forms.py
+++ b/canaille/forms.py
@@ -50,7 +50,7 @@ class PasswordResetForm(FlaskForm):
 class ProfileForm(FlaskForm):
     sub = wtforms.StringField(
         _("Username"),
-        render_kw={"readonly": "true"},
+        render_kw={"placeholder": _("jdoe")},
     )
     #    name = wtforms.StringField(_("Name"))
     given_name = wtforms.StringField(