diff --git a/bin/addons/base/res/partner/partner_demo.xml b/bin/addons/base/res/partner/partner_demo.xml
index d102c7aefe8..794e701c701 100644
--- a/bin/addons/base/res/partner/partner_demo.xml
+++ b/bin/addons/base/res/partner/partner_demo.xml
@@ -120,7 +120,7 @@
 			<field name="name">Bank Wealthy and sons</field>
 		</record>
 		<record id="res_partner_3" model="res.partner">
-			<field name="lang">en</field>
+			<field name="lang">en_US</field>
 			<field name="name">China Export</field>
 			<field name="category_id" eval="[(6, 0, [ref('res_partner_category_9')])]"/>
 		</record>