diff --git a/lib/stripe/stripe_object.rb b/lib/stripe/stripe_object.rb
index 979fd4b7..2fa9cdd3 100644
--- a/lib/stripe/stripe_object.rb
+++ b/lib/stripe/stripe_object.rb
@@ -84,8 +84,8 @@ module Stripe
       # Default to true. TODO: Convert to optional arguments after we're off
       # 1.9 which will make this quite a bit more clear.
       dirty = method_options.fetch(:dirty, true)
-
       values.each do |k, v|
+        add_accessors([k], values) unless metaclass.method_defined?(k.to_sym)
         @values[k] = Util.convert_to_stripe_object(v, opts)
         dirty_value!(@values[k]) if dirty
         @unsaved_values.add(k)
diff --git a/test/stripe/stripe_object_test.rb b/test/stripe/stripe_object_test.rb
index faabc3de..5e211dc1 100644
--- a/test/stripe/stripe_object_test.rb
+++ b/test/stripe/stripe_object_test.rb
@@ -90,6 +90,13 @@ module Stripe
       assert_equal Stripe::StripeObject, obj.metadata.class
     end
 
+    should "create accessors when #update_attributes is called" do
+      obj = Stripe::StripeObject.construct_from({})
+      assert_equal false, obj.send(:metaclass).method_defined?(:foo)
+      obj.update_attributes(:foo => 'bar')
+      assert_equal true, obj.send(:metaclass).method_defined?(:foo)
+    end
+    
     should "warn that #refresh_from is deprecated" do
       old_stderr = $stderr
       $stderr = StringIO.new