diff --git a/app/controllers/todos_controller.rb b/app/controllers/todos_controller.rb
index 50e41a7b..b8f32e68 100644
--- a/app/controllers/todos_controller.rb
+++ b/app/controllers/todos_controller.rb
@@ -1351,16 +1351,6 @@ class TodosController < ApplicationController
     end
   end
 
-  def determine_non_uniq_todo
-    # for calendar view. TODO: unused
-    all_list_uniq_ids = (@due_today.map(&:id) + @due_this_week.map(&:id) +
-      @due_next_week.map(&:id) + @due_this_month.map(&:id) + @due_after_this_month.map(&:id)).uniq
-    all_list_count = @due_today.count + @due_this_week.count +
-      @due_next_week.count + @due_this_month.count + @due_after_this_month.count
-
-    return !( all_list_uniq_ids.length == all_list_count )
-  end
-
   # all completed todos [today@00:00, today@now]
   def get_done_today(completed_todos, includes = {:include => Todo::DEFAULT_INCLUDES})
     start_of_this_day = Time.zone.now.beginning_of_day