diff --git a/lib/marked.js b/lib/marked.js
index 842a8c90f8..5670fcfbbd 100644
--- a/lib/marked.js
+++ b/lib/marked.js
@@ -828,7 +828,8 @@ Parser.prototype.tok = function() {
 
       return '<pre><code'
         + (this.token.lang
-        ? ' class="lang-'
+        ? ' class="'
+        + this.options.langPrefix
         + this.token.lang
         + '"'
         : '')
@@ -1023,7 +1024,8 @@ marked.defaults = {
   pedantic: false,
   sanitize: false,
   silent: false,
-  highlight: null
+  highlight: null,
+  langPrefix: 'lang-'
 };
 
 /**