diff --git a/static/js/kancloud.js b/static/js/kancloud.js
index 520d90c2..2229dc2f 100644
--- a/static/js/kancloud.js
+++ b/static/js/kancloud.js
@@ -70,6 +70,9 @@ function loadDocument($url, $id, $callback) {
  */
 function initHighlighting() {
     $('pre,pre.ql-syntax').each(function (i, block) {
+        if($(this).hasClass('prettyprinted')){
+            return;
+        }
         hljs.highlightBlock(block);
     });
     hljs.initLineNumbersOnLoad();