diff --git a/ui/src/core/xibo-calendar.js b/ui/src/core/xibo-calendar.js
index 3e6585eaff..31218edd69 100644
--- a/ui/src/core/xibo-calendar.js
+++ b/ui/src/core/xibo-calendar.js
@@ -20,7 +20,7 @@
  */
 
 // Global calendar object
-let calendar;
+window.calendar;
 let events = [];
 let mymap;
 let mymapmarker;