diff --git a/addons/crm/crm_opportunity_view.xml b/addons/crm/crm_opportunity_view.xml
index 9b87c64483e..0bb90ad6ac8 100644
--- a/addons/crm/crm_opportunity_view.xml
+++ b/addons/crm/crm_opportunity_view.xml
@@ -252,6 +252,9 @@
                         <button name="case_close" string="Won"
                             states="open,draft,pending" type="object"
                             icon="gtk-apply" />
+                        <button name="case_cancel" string="Lost"
+                            states="open,draft,pending" type="object"
+                            icon="gtk-cancel" />
                     </tree>
                 </field>
             </record>