diff --git a/tailbone/views/users.py b/tailbone/views/users.py
index e222d463..7654a180 100644
--- a/tailbone/views/users.py
+++ b/tailbone/views/users.py
@@ -179,7 +179,7 @@ class UsersView(PrincipalMasterView):
         fs.password.attrs(autocomplete='off')
         fs.append(formalchemy.Field('confirm_password', renderer=PasswordFieldRenderer))
         fs.confirm_password.attrs(autocomplete='off')
-        fs.append(RolesField('roles', renderer=RolesFieldRenderer(self.request)))
+        fs.append(RolesField('roles', renderer=RolesFieldRenderer(self.request), size=10))
 
     def configure_fieldset(self, fs):
         fs.configure(