diff --git a/init.rb b/init.rb
index 89ee737..16129c2 100644
--- a/init.rb
+++ b/init.rb
@@ -1,6 +1,8 @@
 require 'redmine'
 
-require_dependency 'that_issue_reply_button_hook'
+Rails.configuration.to_prepare do
+    require_dependency 'that_issue_reply_button_hook'
+end
 
 Rails.logger.info 'Starting That Issue Reply Button plugin for Redmine'