diff --git a/test/test_kramdown.rb b/test/test_kramdown.rb
index <HASH>..<HASH> 100644
--- a/test/test_kramdown.rb
+++ b/test/test_kramdown.rb
@@ -14,6 +14,7 @@ class TestKramdown < JekyllUnitTest
           'auto_ids' => false,
           'footnote_nr' => 1,
 
+          'syntax_highlighter' => 'rouge',
           'syntax_highlighter_opts' => {
             'bold_every' => 8, 'css' => :class
           }
kramdown: fix state leakage (#<I>) in test

fixes #<I>