diff --git a/lib/plugin/instance.rb b/lib/plugin/instance.rb
index fe6911288..2d3269fc4 100644
--- a/lib/plugin/instance.rb
+++ b/lib/plugin/instance.rb
@@ -3,6 +3,9 @@
 require 'fileutils'
 require 'plugin_registry'
 
+# fab-manager extensible functionalities
+module Plugin; end
+
 class Plugin::Instance
   attr_accessor :path