diff --git a/lib/redmine_admin_activity/models/issue_template_patch.rb b/lib/redmine_admin_activity/models/issue_template_patch.rb
index 9a18818..e357d21 100644
--- a/lib/redmine_admin_activity/models/issue_template_patch.rb
+++ b/lib/redmine_admin_activity/models/issue_template_patch.rb
@@ -28,7 +28,7 @@ def journalized_deactivation_template(project)
   end
 end
 
-class IssueTemplate < ApplicationRecord
+class IssueTemplate
   prepend RedmineAdminActivity::Models::IssueTemplatePatch
 
   has_many :template_projects, through: :issue_template_projects, source: :project, before_remove: :journalized_deactivation_template, after_add: :journalized_activation_template