diff --git a/src/js/vendor/highlight.js b/src/js/vendor/highlight.js
index bee0fdff..d9599693 100644
--- a/src/js/vendor/highlight.js
+++ b/src/js/vendor/highlight.js
@@ -133,7 +133,7 @@
   // eat away line breaks or they would be doubled by the div
   hljs.addPlugin({
     'after:highlightElement': ({ el, result, text }) => {
-      result.value = result.value.replaceAll(/^(\s*)(.+?)\s*<span class="hljs-comment">.*?\bmark-line\b.*?<\/span>\n/mg, '<div class="highlight-line">$1$2</div>')
+      result.value = result.value.replaceAll(/^(\s*)(.+?)\s*<span class="hljs-comment">.*?\bmark-line\b.*?<\/span>\n?/mg, '<div class="highlight-line">$1$2</div>')
     }
   });
 })()