diff --git a/src/plugins/shikiCodeblocks.desktop/index.ts b/src/plugins/shikiCodeblocks.desktop/index.ts
index 12c8c858d..f358497d2 100644
--- a/src/plugins/shikiCodeblocks.desktop/index.ts
+++ b/src/plugins/shikiCodeblocks.desktop/index.ts
@@ -67,7 +67,7 @@ export default definePlugin({
     createHighlighter,
     renderHighlighter: ({ lang, content }: { lang: string; content: string; }) => {
         return createHighlighter({
-            lang,
+            lang: lang?.toLowerCase(),
             content,
             isPreview: false,
         });