diff --git a/app/models/forum_post.rb b/app/models/forum_post.rb
index d9b2ba05..e8e5e4b6 100644
--- a/app/models/forum_post.rb
+++ b/app/models/forum_post.rb
@@ -1,4 +1,6 @@
 class ForumPost < ApplicationRecord
+  LATEST_CACHE_KEY = 'forum_posts_latest_v4'
+
   belongs_to :creator, class_name: "User", foreign_key: :creator_id
   belongs_to :updater, class_name: "User", foreign_key: :last_updated_by
   after_create :initialize_last_updated_by
@@ -156,7 +158,7 @@ class ForumPost < ApplicationRecord
 
   def clear_cache
     Rails.cache.delete "forum_posts"
-    Rails.cache.delete "forum_posts_latest_v3"
+    Rails.cache.delete LATEST_CACHE_KEY
   end
 
   def last_updater
diff --git a/app/views/layouts/_menu.html.erb b/app/views/layouts/_menu.html.erb
index 28060532..186ab986 100644
--- a/app/views/layouts/_menu.html.erb
+++ b/app/views/layouts/_menu.html.erb
@@ -204,7 +204,7 @@
 </div>
 
 <script id="forum-posts-latest" type="application/json">
-  <%= Rails.cache.fetch "forum_posts_latest_v4" do
+  <%= Rails.cache.fetch ForumPost::LATEST_CACHE_KEY do
     ForumPost.latest.map { |p| p.slice(:id, :pages, :title, :updated_at) }.to_json.html_safe
   end %>
 </script>