diff --git a/app/views/events/_day_timeline.html.erb b/app/views/events/_day_timeline.html.erb
index 8961a15d0..91933a709 100644
--- a/app/views/events/_day_timeline.html.erb
+++ b/app/views/events/_day_timeline.html.erb
@@ -1,5 +1,5 @@
-<% day_timeline.events.group_by { it.created_at.hour }.each do |hour, events| %>
-  <% events.group_by { event_column(it) }.each do |column, events| %>
+<% day_timeline.events.group_by { it.created_at.hour }.each do |hour, events_grouped_by_hour| %>
+  <% events_grouped_by_hour.group_by { event_column(it) }.each do |column, events| %>
     <%= event_cluster_tag(hour, column) do %>
       <%= render partial: "events/event", collection: events %>