diff --git a/lib/redmine_dmsf/webdav/base_resource.rb b/lib/redmine_dmsf/webdav/base_resource.rb
index f89fc6da..3a6e76db 100644
--- a/lib/redmine_dmsf/webdav/base_resource.rb
+++ b/lib/redmine_dmsf/webdav/base_resource.rb
@@ -132,6 +132,10 @@ table { width:100%%; }
       def projectless_path
         '/'+path.split('/').drop(2).join('/')
       end
+
+      def path_prefix
+        public_path.gsub(/#{Regexp.escape(path)}$/, '')        
+      end
     end
   end
 end
diff --git a/lib/redmine_dmsf/webdav/dmsf_resource.rb b/lib/redmine_dmsf/webdav/dmsf_resource.rb
index 7b801d68..146be59c 100644
--- a/lib/redmine_dmsf/webdav/dmsf_resource.rb
+++ b/lib/redmine_dmsf/webdav/dmsf_resource.rb
@@ -601,7 +601,7 @@ module RedmineDmsf
                 end
 
                 lock_entity = lock.folder || lock.file
-                lock_path = "#{request.scheme}://#{request.host}:#{request.port}/dmsf/webdav/#{URI.escape(lock_entity.project.identifier)}/"
+                lock_path = "#{request.scheme}://#{request.host}:#{request.port}#{path_prefix}#{URI.escape(lock_entity.project.identifier)}/"
                 lock_path << lock_entity.dmsf_path.map {|x| URI.escape(x.respond_to?('name') ? x.name : x.title) }.join('/')
                 lock_path << "/" if lock_entity.is_a?(DmsfFolder) && lock_path[-1,1] != '/'
                 doc.lockroot { doc.href lock_path }