diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index d3696cbb8a4c5d4f9fe1b3b425978bf1a1b9dc8e..cf10190bd12861e7132554134e42f99aee434ba0 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -181,7 +181,7 @@ def message
     end
     alias_method :status_message, :message
 
-    def respond_to?(method)
+    def respond_to?(method, include_private = false)
       if method.to_s == 'to_path'
         stream.respond_to?(:to_path)
       else
diff --git a/actionpack/test/dispatch/response_test.rb b/actionpack/test/dispatch/response_test.rb
index 2fbe7358f962347d8526081babde42e6077a65f8..4501ea095c554408f5a0f27903e583de965e2d62 100644
--- a/actionpack/test/dispatch/response_test.rb
+++ b/actionpack/test/dispatch/response_test.rb
@@ -212,6 +212,11 @@ def test_response_body_encoding
       ActionDispatch::Response.default_headers = nil
     end
   end
+
+  test "respond_to? accepts include_private" do
+    assert_not @response.respond_to?(:method_missing)
+    assert @response.respond_to?(:method_missing, true)
+  end
 end
 
 class ResponseIntegrationTest < ActionDispatch::IntegrationTest
diff --git a/railties/lib/rails/railtie/configuration.rb b/railties/lib/rails/railtie/configuration.rb
index 0cbbf04da2acb61582a7a2226d9f324ce70c18b0..eb3b2d8ef40f3b94d35c1191379b2adb2916be72 100644
--- a/railties/lib/rails/railtie/configuration.rb
+++ b/railties/lib/rails/railtie/configuration.rb
@@ -80,7 +80,7 @@ def to_prepare(&blk)
         to_prepare_blocks << blk if blk
       end
 
-      def respond_to?(name)
+      def respond_to?(name, include_private = false)
         super || @@options.key?(name.to_sym)
       end
 
diff --git a/railties/test/application/configuration_test.rb b/railties/test/application/configuration_test.rb
index c51488e0e1ca4ae524b68d5228388b0bfd8b4afb..03a735b1c197cd4c92d6df02ec3dfe9ed01b5808 100644
--- a/railties/test/application/configuration_test.rb
+++ b/railties/test/application/configuration_test.rb
@@ -679,5 +679,12 @@ def index
       end
       assert_equal Logger::INFO, Rails.logger.level
     end
+
+    test "respond_to? accepts include_private" do
+      make_basic_app
+
+      assert_not Rails.configuration.respond_to?(:method_missing)
+      assert Rails.configuration.respond_to?(:method_missing, true)
+    end
   end
 end