diff --git a/middleman-core/lib/middleman-core/cli/build.rb b/middleman-core/lib/middleman-core/cli/build.rb
index b8041060..2a9eaef1 100644
--- a/middleman-core/lib/middleman-core/cli/build.rb
+++ b/middleman-core/lib/middleman-core/cli/build.rb
@@ -97,9 +97,7 @@ module Middleman::Cli
       def shared_rack
         @_shared_rack ||= begin
           mock = ::Rack::MockSession.new(shared_server.to_rack_app)
-          sess = ::Rack::Test::Session.new(mock)
-          response = sess.get("__middleman__")
-          sess
+          ::Rack::Test::Session.new(mock)
         end
       end
     
@@ -279,4 +277,4 @@ class ::Thor::Actions::CreateFile
       block.call unless pretend?
     end
   end
-end
\ No newline at end of file
+end