diff --git a/spec/libraries/pacemaker/resource_spec.rb b/spec/libraries/pacemaker/resource_spec.rb
index 6f82dbf..35d2816 100644
--- a/spec/libraries/pacemaker/resource_spec.rb
+++ b/spec/libraries/pacemaker/resource_spec.rb
@@ -1,3 +1,5 @@
+require 'mixlib/shellout'
+
 require 'spec_helper'
 
 this_dir = File.dirname(__FILE__)