diff --git a/lib/plugins/tag/code.js b/lib/plugins/tag/code.js
index d668a3cb7d..5301ba6873 100644
--- a/lib/plugins/tag/code.js
+++ b/lib/plugins/tag/code.js
@@ -150,7 +150,7 @@ module.exports = ctx => function codeTag(args, content) {
       mark,
       tab: hljsCfg.tab_replace,
       autoDetect: hljsCfg.auto_detect,
-      wrap: typeof wrap === 'undefined' ? wrap : hljsCfg.wrap
+      wrap: typeof wrap === 'boolean' ? wrap : hljsCfg.wrap
     };
 
     content = highlight(content, hljsOption);