diff --git a/vendor/plugins/acts_as_attachable/lib/acts_as_attachable.rb b/vendor/plugins/acts_as_attachable/lib/acts_as_attachable.rb
index d59c89110..e840770a3 100644
--- a/vendor/plugins/acts_as_attachable/lib/acts_as_attachable.rb
+++ b/vendor/plugins/acts_as_attachable/lib/acts_as_attachable.rb
@@ -33,7 +33,6 @@ module Redmine
                                                :order => "#{Attachment.table_name}.created_on",
                                                :dependent => :destroy)
           attr_accessor :unsaved_attachments
-          after_initialize :initialize_unsaved_attachments
           send :include, Redmine::Acts::Attachable::InstanceMethods
         end
       end
@@ -53,10 +52,6 @@ module Redmine
             user.allowed_to?(self.class.attachable_options[:delete_permission], self.project)
         end
 
-        def initialize_unsaved_attachments
-          @unsaved_attachments ||= []
-        end
-
         module ClassMethods
         end
       end