diff --git a/addons/calendar/static/src/js/base_calendar.js b/addons/calendar/static/src/js/base_calendar.js
index e6dad933f81..3533ef9b5a4 100644
--- a/addons/calendar/static/src/js/base_calendar.js
+++ b/addons/calendar/static/src/js/base_calendar.js
@@ -116,6 +116,9 @@ widgets.SidebarFilter.include({
     },
     initialize_m2o: function() {
         var self = this;
+        if (!this.view.useContacts) {
+            return;
+        }
         this.dfm = new form_common.DefaultFieldManager(self);
         this.dfm.extend_field_desc({
             partner_id: {