diff --git a/src/lib/output/plugins/MarkedPlugin.ts b/src/lib/output/plugins/MarkedPlugin.ts
index 22a735567..3a5a51df8 100644
--- a/src/lib/output/plugins/MarkedPlugin.ts
+++ b/src/lib/output/plugins/MarkedPlugin.ts
@@ -87,7 +87,8 @@ export class MarkedPlugin extends ContextAwareRendererComponent {
         Handlebars.registerHelper('relativeURL', (url: string) => url ? this.getRelativeUrl(url) : url);
 
         Marked.setOptions({
-            highlight: (text: any, lang: any) => this.getHighlighted(text, lang)
+            highlight: (text: any, lang: any) => this.getHighlighted(text, lang),
+            langPrefix: 'language-'
         });
     }