diff --git a/app/views/custom_fields/_form.html.erb b/app/views/custom_fields/_form.html.erb
index 5a90cc0..485aeb3 100644
--- a/app/views/custom_fields/_form.html.erb
+++ b/app/views/custom_fields/_form.html.erb
@@ -92,7 +92,7 @@ when "IssueCustomField" %>
<% Role.givable.sorted.each do |role| %>
<% end %>
@@ -103,7 +103,7 @@ when "IssueCustomField" %>
<% Tracker.sorted.each do |tracker| %>
<%= check_box_tag "custom_field[tracker_ids][]",
tracker.id,
- (@custom_field.trackers.include? tracker),
+ (@custom_field.trackers.to_a.include? tracker),
:id => "custom_field_tracker_ids_#{tracker.id}" %>