diff --git a/test/unit/helpers/search_helper_test.rb b/test/unit/helpers/search_helper_test.rb
index 98e5afc8d..c37baf76e 100644
--- a/test/unit/helpers/search_helper_test.rb
+++ b/test/unit/helpers/search_helper_test.rb
@@ -21,6 +21,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 
 class SearchHelperTest < ActionView::TestCase
   include SearchHelper
+  include ERB::Util
 
   def test_highlight_single_token
     assert_equal 'This is a <span class="highlight token-0">token</span>.',