diff --git a/addons/hr_expense/hr_expense_view.xml b/addons/hr_expense/hr_expense_view.xml
index e57f20734eb..8b6d81ef18c 100644
--- a/addons/hr_expense/hr_expense_view.xml
+++ b/addons/hr_expense/hr_expense_view.xml
@@ -65,10 +65,10 @@
             <field name="arch" type="xml">
                 <form string="Expenses Sheet" version="7.0">
                 <header>
-                    <button name="confirm" states="draft" string="Submit to Manager" type="workflow"/>
-                    <button name="validate" states="confirm" string="Approve" type="workflow" groups="base.group_hr_user"/>
-                    <button name="draft" states="confirm,cancelled" string="Set to Draft" type="workflow" groups="base.group_hr_user"/>
-                    <button name="invoice" states="accepted" string="Invoice" type="object" groups="base.group_hr_user"/>
+                    <button name="confirm" states="draft" string="Submit to Manager" type="workflow" class="oe_form_button_active_flow"/>
+                    <button name="validate" states="confirm" string="Approve" type="workflow" groups="base.group_hr_user" class="oe_form_button_active_flow"/>
+                    <button name="draft" states="confirm,cancelled" string="Set to Draft" type="workflow" groups="base.group_hr_user" class="oe_form_button_return_flow"/>
+                    <button name="invoice" states="accepted" string="Invoice" type="object" groups="base.group_hr_user" class="oe_form_button_active_flow"/>
                     <button name="refuse" states="confirm,accepted" string="Refuse" type="workflow" groups="base.group_hr_user" />
                     <field name="state" widget="statusbar" statusbar_visible="draft,confirm,accepted" statusbar_colors='{"confirm":"blue","cancelled":"red"}'/>
                 </header>