diff --git a/lib/sinatra/base.rb b/lib/sinatra/base.rb
index b8299876..1e61fc65 100644
--- a/lib/sinatra/base.rb
+++ b/lib/sinatra/base.rb
@@ -132,7 +132,7 @@ module Sinatra
   # http://rubydoc.info/github/rack/rack/master/Rack/Response
   # http://rubydoc.info/github/rack/rack/master/Rack/Response/Helpers
   class Response < Rack::Response
-    DROP_BODY_RESPONSES = [204, 205, 304]
+    DROP_BODY_RESPONSES = [204, 304]
     def initialize(*)
       super
       headers['Content-Type'] ||= 'text/html'
diff --git a/test/helpers_test.rb b/test/helpers_test.rb
index d8f65ddc..52d5fbce 100644
--- a/test/helpers_test.rb
+++ b/test/helpers_test.rb
@@ -8,7 +8,7 @@ class HelpersTest < Minitest::Test
   end
 
   def status_app(code, &block)
-    code += 2 if [204, 205, 304].include? code
+    code += 2 if [204, 304].include? code
     block ||= proc { }
     mock_app do
       get('/') do
diff --git a/test/response_test.rb b/test/response_test.rb
index 64b5e0ee..a5d360b4 100644
--- a/test/response_test.rb
+++ b/test/response_test.rb
@@ -27,7 +27,7 @@ class ResponseTest < Minitest::Test
     assert_equal 'Hello World', @response.body.join
   end
 
-  [204, 205, 304].each do |status_code|
+  [204, 304].each do |status_code|
     it "removes the Content-Type header and body when response status is #{status_code}" do
       @response.status = status_code
       @response.body = ['Hello World']