diff --git a/config/routes.rb b/config/routes.rb
index 5b765520..34604610 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -117,7 +117,7 @@ RedmineApp::Application.routes.draw do
     :resource_class => RedmineDmsf::Webdav::ResourceProxy,
     :controller_class => RedmineDmsf::Webdav::Controller,
     :log_to => Rails.logger
-  ), :at => '/dmsf/webdav'
+  ), :at => '/dmsf/webdav'  if defined?(RedmineDmsf)
 
   # Approval workflow
   resources :dmsf_workflows do