diff --git a/addons/mail/static/src/js/announcement.js b/addons/mail/static/src/js/announcement.js
index 9cc1d8bc6c3..7afb25a7da0 100644
--- a/addons/mail/static/src/js/announcement.js
+++ b/addons/mail/static/src/js/announcement.js
@@ -36,11 +36,13 @@ openerp_announcement = function(instance) {
                             $('.openerp_webclient_container').css('height', 'calc(100% - 34px)');                            
                         }, 400);
                     };
+                    var height = $('#announcement_bar_table').outerHeight() 
+                                + $('#oe_main_menu_navbar').outerHeight();
+                    $('.openerp_webclient_container').css('height', 'calc(100% - ' + height + 'px)');
                     $bar.find('.close').on('click', close);
                     self.trigger('ab_loaded', $bar);
                 });
 
-                $('.openerp_webclient_container').css('height', 'calc(100% - 64px)');
                 $('head').append($css);
             }).fail(function(result, ev){
                 ev.preventDefault();