diff --git a/patches/workload_init.patch b/patches/workload_init.patch
index 042af4b..331a658 100644
--- a/patches/workload_init.patch
+++ b/patches/workload_init.patch
@@ -1,6 +1,14 @@
 --- "a/plugins/redmine_workload/init.rb"
 +++ "b/plugins/redmine_workload/init.rb"
-@@ -44,12 +44,12 @@ Redmine::Plugin.register :redmine_workload do
+@@ -2,6 +2,7 @@
+ 
+ require 'redmine'
+ require File.expand_path('lib/redmine_workload', __dir__)
++require './group_workload_preparer.rb'
+ 
+ Redmine::Plugin.register :redmine_workload do
+   name 'Redmine workload plugin'
+@@ -44,12 +45,12 @@ Redmine::Plugin.register :redmine_workload do
    permission :edit_user_data,        wl_user_datas: :update
  end