diff --git a/app/views/common/upsale.html.erb b/app/views/common/upsale.html.erb
index bc87939942..52000b6d8c 100644
--- a/app/views/common/upsale.html.erb
+++ b/app/views/common/upsale.html.erb
@@ -40,7 +40,7 @@
     <%= t('admin.enterprise.upgrade_info') %>
     </p>
     <%= link_to( "https://www.openproject.org/contact/",
-                 { class: 'button -highlight-inverted -round',
+                 { class: 'button',
                    aria: {label: t('admin.enterprise.buttons.contact')},
                    target: '_blank',
                    title: t('admin.enterprise.buttons.contact')}) do %>