diff --git a/addons/crm_partner_assign/crm_portal_view.xml b/addons/crm_partner_assign/crm_portal_view.xml
index dab831dcb4b..3c0a2b6d140 100644
--- a/addons/crm_partner_assign/crm_portal_view.xml
+++ b/addons/crm_partner_assign/crm_portal_view.xml
@@ -114,7 +114,7 @@
                       <separator string="Contact" colspan="2"/>
                       <group col="2">
                           <field name="partner_id" select="1"
-                            on_change="onchange_partner_id(partner_id, email_from)" string="Customer"
+                            string="Customer"
                             colspan="2" readonly="1"/>
                           <field name="partner_name" string="Customer Name" readonly="1"/>
                           <field domain="[('domain', '=', 'contact')]" name="title" widget="selection" readonly="1"/>