diff --git a/test/rdoc/test_rdoc_servlet.rb b/test/rdoc/test_rdoc_servlet.rb
index 977251308a..c41c2c8ae7 100644
--- a/test/rdoc/test_rdoc_servlet.rb
+++ b/test/rdoc/test_rdoc_servlet.rb
@@ -548,4 +548,4 @@ def touch_extra_cache_path
     store.save
   end
 
-end
+end if defined?(WEBrick)