diff --git a/test/functional/helper.rb b/test/functional/helper.rb
index c2ef097ec..a0d7869f8 100644
--- a/test/functional/helper.rb
+++ b/test/functional/helper.rb
@@ -81,7 +81,9 @@ module FunctionalHelper
     path.gsub!('//vboxsrv', 'C:') if is_windows?
     path
   end
-  let(:exec_inspec) { File.join(repo_path, 'inspec-bin', 'bin', 'inspec') }
+  let(:inspec_path) { File.join(repo_path, 'inspec-bin', 'bin', 'inspec') }
+  libdir = File.expand_path "lib"
+  let(:exec_inspec) { [Gem.ruby, "-I#{libdir}", inspec_path].join " " }
   let(:mock_path) { File.join(repo_path, 'test', 'unit', 'mock') }
   let(:profile_path) { File.join(mock_path, 'profiles') }
   let(:examples_path) { File.join(profile_path, 'old-examples') }