diff --git a/lib/rack/server.rb b/lib/rack/server.rb
index f0bc15009..6137f043b 100644
--- a/lib/rack/server.rb
+++ b/lib/rack/server.rb
@@ -262,13 +262,11 @@ def default_middleware_by_environment
         m = Hash.new {|h, k| h[k] = []}
         m["deployment"] = [
           [Rack::ContentLength],
-          [Rack::Chunked],
           logging_middleware,
           [Rack::TempfileReaper]
         ]
         m["development"] = [
           [Rack::ContentLength],
-          [Rack::Chunked],
           logging_middleware,
           [Rack::ShowExceptions],
           [Rack::Lint],