diff --git a/addons/gamification/views/challenge.xml b/addons/gamification/views/challenge.xml
index 75dcd4a7959..87dea680222 100644
--- a/addons/gamification/views/challenge.xml
+++ b/addons/gamification/views/challenge.xml
@@ -48,6 +48,7 @@
                             <label for="user_domain" class="oe_edit_only" string="Assign Challenge To"/>
                             <div>
                                 <field name="user_domain" widget="char_domain" options="{'model': 'res.users'}" />
+                                <field name="user_ids" groups="base.group_no_one" widget="many2many_tags" />
                             </div>
                         </div>