diff --git a/addons/crm/crm_lead_view.xml b/addons/crm/crm_lead_view.xml
index f43974bbf9d..eb1b94b0614 100644
--- a/addons/crm/crm_lead_view.xml
+++ b/addons/crm/crm_lead_view.xml
@@ -408,7 +408,7 @@
                 <form string="Opportunities">
                     <header>
                         <button name="action_set_won" string="Mark Won"
-                                type="object" class="oe_highlight"
+                                type="object" class="oe_highlight o_wow"
                                 attrs="{'invisible': ['|', ('active','=',False), ('probability', '=', 100)]}"/>
                         <button name="%(crm.crm_lead_lost_action)d" string="Mark Lost"
                                 type="action" class="oe_highlight"