diff --git a/config/routes.rb b/config/routes.rb
index 22fc44a4f5aecfaec94cfbc82491a557af89def9..1483888987566d9ceb10829ef093219f91cbcea2 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -378,7 +378,7 @@ Rails.application.routes.draw do
 
   get 'robots.txt', :to => 'welcome#robots'
 
-  Dir.glob File.expand_path("#{Redmine::Plugin.directory}/*", Rails.root) do |plugin_dir|
+  Dir.glob File.expand_path("#{Redmine::Plugin.directory}/*") do |plugin_dir|
     file = File.join(plugin_dir, "config/routes.rb")
     if File.exists?(file)
       begin