diff --git a/addons/mass_mailing/views/mass_mailing_views.xml b/addons/mass_mailing/views/mass_mailing_views.xml
index cdb9e90ebb3..9a8d203b67a 100644
--- a/addons/mass_mailing/views/mass_mailing_views.xml
+++ b/addons/mass_mailing/views/mass_mailing_views.xml
@@ -649,7 +649,7 @@
                                         <field name="campaign_id"
                                             string="UTM Campaign"
                                             groups="base.group_no_one"/>
-                                        <field name="source_id" readonly="1"
+                                        <field name="source_id"
                                             readonly="1"
                                             string="Source"
                                             required="False"