diff --git a/plugins/guests/slackware/plugin.rb b/plugins/guests/slackware/plugin.rb
index c81db6aa4..f118a1a85 100644
--- a/plugins/guests/slackware/plugin.rb
+++ b/plugins/guests/slackware/plugin.rb
@@ -7,7 +7,7 @@ module VagrantPlugins
       description "Slackware guest support."
 
       guest("slackware", "linux") do
-        require File.expand_path("../guest", __FILE__)
+        require_relative "guest"
         Guest
       end