diff --git a/add-to-calendar.js b/add-to-calendar.js
index 97b6051..bc5a2f4 100644
--- a/add-to-calendar.js
+++ b/add-to-calendar.js
@@ -468,6 +468,9 @@
       console.error('Event details missing.');
       return;
     }
+    
+    // Get the event ID into params.data object before calling generateMarkup().
+    params.data.id = params.options.id;
 
     return generateMarkup(
       generateCalendars(params.data),
@@ -483,4 +486,4 @@
     addToCalendar(document.querySelectorAll(CONFIG.selector));
   });
   
-})(this);
\ No newline at end of file
+})(this);