diff --git a/src/resources/pre_template.html b/src/resources/pre_template.html
index f2142cc7..b7c37693 100644
--- a/src/resources/pre_template.html
+++ b/src/resources/pre_template.html
@@ -26,7 +26,9 @@
 
       var codes = document.getElementsByTagName('code');
       for (var i = 0; i < codes.length; ++i) {
-          hljs.highlightBlock(codes[i]);
+          if (codes[i].parentElement.tagName.toLowerCase() == 'pre') {
+              hljs.highlightBlock(codes[i]);
+          }
       }
   }