diff --git a/test/rdoc/support/test_case.rb b/test/rdoc/support/test_case.rb
index 67c91a8c90..cb1a3bddd9 100644
--- a/test/rdoc/support/test_case.rb
+++ b/test/rdoc/support/test_case.rb
@@ -13,7 +13,10 @@
 require 'tmpdir'
 require 'stringio'
 
-require_relative '../../lib/helper'
+begin
+  require_relative '../../lib/helper'
+rescue LoadError
+end
 require_relative '../../../lib/rdoc'
 
 ##