diff --git a/addons/stock/report/report_deliveryslip.xml b/addons/stock/report/report_deliveryslip.xml
index f51a7bc4f83..f04fe3b5e26 100644
--- a/addons/stock/report/report_deliveryslip.xml
+++ b/addons/stock/report/report_deliveryslip.xml
@@ -3,7 +3,7 @@
     <template id="report_delivery_document">
         <t t-call="web.html_container">
             <t t-call="web.external_layout">
-                <t t-set="o" t-value="o.with_context(lang=o.partner_id.lang)" />
+                <t t-set="o" t-value="o.with_context(lang=o.partner_id.lang or o.env.lang)" />
                 <t t-set="partner" t-value="o.partner_id or (o.move_ids and o.move_ids[0].partner_id) or False"/>
 
                 <t t-set="address">
@@ -273,7 +273,7 @@
 
     <template id="report_deliveryslip">
         <t t-foreach="docs" t-as="o">
-            <t t-call="stock.report_delivery_document" t-lang="o.partner_id.lang"/>
+            <t t-call="stock.report_delivery_document" t-lang="o.partner_id.lang or o.env.lang"/>
         </t>
     </template>
 </odoo>