diff --git a/src/services/markdownConversionSvc.js b/src/services/markdownConversionSvc.js
index 5664c50b..77fb8a7c 100644
--- a/src/services/markdownConversionSvc.js
+++ b/src/services/markdownConversionSvc.js
@@ -44,7 +44,7 @@ const noSpellcheckTokens = Object.create(null);
 [
   'code',
   'pre',
-  'pre gfm',
+  'pre gfm cn-code',
   'math block',
   'math inline',
   'math expr block',