diff --git a/middleman-core/lib/middleman-core/core_extensions/request.rb b/middleman-core/lib/middleman-core/core_extensions/request.rb
index 612001e1..05dc5705 100644
--- a/middleman-core/lib/middleman-core/core_extensions/request.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/request.rb
@@ -4,6 +4,7 @@ require 'rack/file'
 require 'rack/lint'
 require 'rack/head'
 
+require 'middleman-core/application'
 require 'middleman-core/util'
 
 module Middleman