diff --git a/spec/integration/rack/app.rb b/spec/integration/rack/app.rb
index 24d3a4fa..bbd18b58 100644
--- a/spec/integration/rack/app.rb
+++ b/spec/integration/rack/app.rb
@@ -38,7 +38,8 @@ class RackApp < Sinatra::Base
   end
 
   post "/upload" do
-    params[:uploaded_file].to_yaml
+    uploaded_file = params[:uploaded_file]
+    Marshal.dump(:tempfile => uploaded_file[:tempfile].read, :type => uploaded_file[:type], :filename => uploaded_file[:filename])
   end
 end
 
diff --git a/spec/integration/rack/test/webrat_rack_test.rb b/spec/integration/rack/test/webrat_rack_test.rb
index b49688fd..1f0991d6 100644
--- a/spec/integration/rack/test/webrat_rack_test.rb
+++ b/spec/integration/rack/test/webrat_rack_test.rb
@@ -53,10 +53,10 @@ def test_upload_file
     attach_file "File", __FILE__, "text/ruby"
     click_button "Upload"
 
-    upload = YAML.load(response_body)
+    upload = Marshal.load(response_body)
     assert_equal "text/ruby", upload[:type]
     assert_equal "webrat_rack_test.rb", upload[:filename]
-    assert upload[:tempfile].respond_to?(:read)
+    assert_equal File.read(__FILE__), upload[:tempfile]
   end
 end