diff --git a/addons/mail/mail_demo.xml b/addons/mail/mail_demo.xml
index 6c25b59e35d..0a4751cedb1 100644
--- a/addons/mail/mail_demo.xml
+++ b/addons/mail/mail_demo.xml
@@ -41,7 +41,6 @@ Nulla turpis leo, rhoncus ut egestas sit amet, consectetur vitae urna. Mauris in
         </record>
 
         <record id="message_blogpost0_comment0" model="mail.message">
-            <field name="subject">Reply</field>
             <field name="model">mail.group</field>
             <field name="res_id" ref="group_all_company"/>
             <field name="content_subtype">html</field>
@@ -52,7 +51,6 @@ Nulla turpis leo, rhoncus ut egestas sit amet, consectetur vitae urna. Mauris in
         </record>
 
         <record id="message_blogpost0_comment1" model="mail.message">
-            <field name="subject">Reply</field>
             <field name="model">mail.group</field>
             <field name="res_id" ref="group_all_company"/>
             <field name="content_subtype">html</field>
@@ -75,7 +73,6 @@ Would it be possible to learn more about the author ?  (second comment)]]></fiel
         </record>
 
         <record id="message_blogpost0_comment2" model="mail.message">
-            <field name="subject">Reply</field>
             <field name="model">mail.group</field>
             <field name="res_id" ref="group_all_company"/>
             <field name="content_subtype">html</field>