diff --git a/test/helper.rb b/test/helper.rb
index bf87eff..b7a47ac 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -49,7 +49,7 @@ def rebuild_model options = {}
     include DataMapper::Resource
     include DataMapper::Validate
     include Paperclip::Resource
-    property :id, Integer, :serial => true
+    property :id, Serial
     property :other, String
     has_attached_file :avatar, options
   end
diff --git a/test/paperclip_test.rb b/test/paperclip_test.rb
index 40ecd85..9506cd0 100644
--- a/test/paperclip_test.rb
+++ b/test/paperclip_test.rb
@@ -21,7 +21,7 @@ class PaperclipTest < Test::Unit::TestCase
         include DataMapper::Resource
         include DataMapper::Validate
         include Paperclip::Resource
-        property :id, Integer, :serial => true
+        property :id, Serial
         property :other, String
         has_attached_file :file
       end