diff --git a/timesheet.xml b/timesheet.xml
index da63c67515..16436b4874 100644
--- a/timesheet.xml
+++ b/timesheet.xml
@@ -18,7 +18,9 @@ this repository contains the full copyright notices and license terms. -->
     <record model="ir.action.act_window" id="act_timesheet_line_form_invoice">
         <field name="name">Timesheet Lines</field>
         <field name="res_model">timesheet.line</field>
-        <field name="domain">[('invoice_line.invoice', 'in', Eval('active_ids'))]</field>
+        <field name="domain"
+            eval="[('invoice_line.invoice', 'in', Eval('active_ids'))]"
+            pyson="1"/>
     </record>
     <record model="ir.action.keyword"
         id="act_timesheet_line_form_invoice_keyword1">