diff --git a/addons/mail/static/src/views/fields/many2many_tags_email/many2many_tags_email.js b/addons/mail/static/src/views/fields/many2many_tags_email/many2many_tags_email.js
index 7750798b4df..d20a0247e1b 100644
--- a/addons/mail/static/src/views/fields/many2many_tags_email/many2many_tags_email.js
+++ b/addons/mail/static/src/views/fields/many2many_tags_email/many2many_tags_email.js
@@ -87,18 +87,8 @@ FieldMany2ManyTagsEmail.fieldsToFetch = Object.assign({},
     Many2ManyTagsField.fieldsToFetch,
     {email: {name: 'email', type: 'char'}}
 );
+
+FieldMany2ManyTagsEmail.additionalClasses = ["o_field_many2many_tags"];
+
 registry.category("fields").add("many2many_tags_email", FieldMany2ManyTagsEmail);
 
-/* fieldsToFetch are retrieved from legacy widget.. */
-import field_registry from 'web.field_registry';
-import relational_fields from 'web.relational_fields';
-
-var M2MTags = relational_fields.FieldMany2ManyTags;
-
-var FieldMany2ManyTagsEmailLegacy = M2MTags.extend({
-    fieldsToFetch: _.extend({}, M2MTags.prototype.fieldsToFetch, {
-        email: {type: 'char'},
-    }),
-});
-
-field_registry.add('many2many_tags_email', FieldMany2ManyTagsEmailLegacy);