diff --git a/app/helpers/todos_helper.rb b/app/helpers/todos_helper.rb
index 8426bd8e..8b04e928 100644
--- a/app/helpers/todos_helper.rb
+++ b/app/helpers/todos_helper.rb
@@ -570,7 +570,7 @@ module TodosHelper
   end
 
   def context_container_id(todo)
-    return "c#{todo.context_id}"
+    return "context_#{todo.context_id}"
   end
 
   def todo_container_id(todo)