diff --git a/middleman-core/lib/middleman/rack.rb b/middleman-core/lib/middleman/rack.rb
index 6fbd2129..51ddb4c4 100644
--- a/middleman-core/lib/middleman/rack.rb
+++ b/middleman-core/lib/middleman/rack.rb
@@ -2,3 +2,4 @@ require 'middleman-core/load_paths'
 ::Middleman.setup_load_paths
 
 require 'middleman-core'
+require 'middleman-core/application'