diff --git a/addons/web/static/src/js/views/form_relational_widgets.js b/addons/web/static/src/js/views/form_relational_widgets.js
index 4c7b84b6dfc..624a2fa17a4 100644
--- a/addons/web/static/src/js/views/form_relational_widgets.js
+++ b/addons/web/static/src/js/views/form_relational_widgets.js
@@ -863,9 +863,6 @@ var FieldX2Many = AbstractManyField.extend({
         }
         return true;
     },
-    is_false: function() {
-        return false;
-    },
 });
 
 var X2ManyDataSet = data.BufferedDataSet.extend({