diff --git a/lib/redmine_dmsf/patches/issue_patch.rb b/lib/redmine_dmsf/patches/issue_patch.rb
index 6408b3e8..0f8960f4 100644
--- a/lib/redmine_dmsf/patches/issue_patch.rb
+++ b/lib/redmine_dmsf/patches/issue_patch.rb
@@ -26,7 +26,7 @@ module RedmineDmsf
       ##################################################################################################################
       # New methods
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           before_destroy :delete_system_folder, prepend: true
         end