diff --git a/app/models/label_model.rb b/app/models/label_model.rb
new file mode 100644
index 000000000..4fb427394
--- /dev/null
+++ b/app/models/label_model.rb
@@ -0,0 +1 @@
+LabelModel = Struct.new(:id, :label, keyword_init: true)
diff --git a/app/models/zone.rb b/app/models/zone.rb
index cf8c806c2..20829bc81 100644
--- a/app/models/zone.rb
+++ b/app/models/zone.rb
@@ -19,7 +19,7 @@ class Zone < ApplicationRecord
   def self.available_at(date, without_zones = [])
     (Zone.all - without_zones).filter { |zone| zone.available_at?(date) }.sort_by { |zone| zone.label_at(date) }
       .map do |zone|
-      OpenStruct.new(id: zone.id, label: zone.label_at(date))
+      LabelModel.new(id: zone.id, label: zone.label_at(date))
     end
   end