diff --git a/app/views/todos/calendar.ics.erb b/app/views/todos/calendar.ics.erb
index 6f3960dc..8378a096 100644
--- a/app/views/todos/calendar.ics.erb
+++ b/app/views/todos/calendar.ics.erb
@@ -20,7 +20,7 @@ CLASS:PUBLIC
 CATEGORIES:Tracks
 CREATED:<%= todo.created_at.strftime("%Y%m%dT%H%M%SZ") %>
 DESCRIPTION:<%= format_ical_notes(todo.notes) %>
-LAST-MODIFIED:<%= updated_at.strftime("%Y%m%dT%H%M%SZ") %>
+LAST-MODIFIED:<%= todo.updated_at.strftime("%Y%m%dT%H%M%SZ") %>
 LOCATION:
 SEQUENCE:0
 STATUS:CONFIRMED