diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index 3e63def27..934a82fec 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -13,7 +13,7 @@ class ApplicationController < ActionController::Base
   before_action :api_check
   before_action :ip_ban_check
   before_action :set_variant
-  before_action :enable_cors
+  before_action :add_headers
   before_action :cause_error
   after_action :reset_current_user
   layout "default"
@@ -65,8 +65,9 @@ class ApplicationController < ActionController::Base
 
   protected
 
-  def enable_cors
+  def add_headers
     response.headers["Access-Control-Allow-Origin"] = "*"
+    response.headers["X-Git-Hash"] = Rails.application.config.x.git_hash
   end
 
   def api_check
diff --git a/app/views/layouts/default.html.erb b/app/views/layouts/default.html.erb
index 03d11c3c5..7944e26c1 100644
--- a/app/views/layouts/default.html.erb
+++ b/app/views/layouts/default.html.erb
@@ -77,6 +77,8 @@
   <%= tag.meta name: "twitter:title", content: page_title %>
   <%= tag.meta name: "twitter:description", content: meta_description %>
 
+  <%= tag.meta name: "git-hash", content: Rails.application.config.x.git_hash %>
+
   <%= yield :html_header %>
   <%= raw Danbooru.config.custom_html_header_content %>
 </head>
diff --git a/config/application.rb b/config/application.rb
index 075a741f2..c8a3373fc 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -50,7 +50,7 @@ module Danbooru
     if File.exist?("#{config.root}/REVISION")
       config.x.git_hash = File.read("#{config.root}/REVISION").strip
     elsif system("type git > /dev/null && git rev-parse --show-toplevel > /dev/null")
-      config.x.git_hash = `git rev-parse --short HEAD`.strip
+      config.x.git_hash = `git rev-parse HEAD`.strip
     else
       config.x.git_hash = nil
     end