diff --git a/test/test_related_posts.rb b/test/test_related_posts.rb
index 27529bb3..79409f84 100644
--- a/test/test_related_posts.rb
+++ b/test/test_related_posts.rb
@@ -29,7 +29,7 @@ class TestRelatedPosts < Test::Unit::TestCase
                                                'destination' => dest_dir,
                                                'lsi' => true})
       end
-      any_instance_of(Jekyll::RelatedPosts, :display => nil)
+      any_instance_of(Jekyll::RelatedPosts) { |i| stub(i).display }
       @site = Site.new(Jekyll.configuration)
     end