diff --git a/app/views/events/show.ics.haml b/app/views/events/show.ics.haml
index 423df001..f79ca1da 100644
--- a/app/views/events/show.ics.haml
+++ b/app/views/events/show.ics.haml
@@ -1,4 +1,6 @@
 :ruby
+  require 'icalendar/tzinfo'
+
   # Create a calendar with an event (standard method)
   cal = Icalendar::Calendar.new
   tzid = @event.region.tzid