diff --git a/src/node/markdown/plugins/lineNumbers.ts b/src/node/markdown/plugins/lineNumbers.ts
index 739b022279ac..43156e983444 100644
--- a/src/node/markdown/plugins/lineNumbers.ts
+++ b/src/node/markdown/plugins/lineNumbers.ts
@@ -21,7 +21,7 @@ export const lineNumberPlugin = (md: MarkdownIt) => {
 
     const finalCode = rawCode
       .replace(/<\/div>$/, `${lineNumbersWrapperCode}</div>`)
-      .replace(/"(language-\w*)"/, '"$1 line-numbers-mode"')
+      .replace(/"(language-[-\w]*)"/, '"$1 line-numbers-mode"')
 
     return finalCode
   }