diff --git a/app/posts/[slug]/page.tsx b/app/posts/[slug]/page.tsx
index 3f296c2..17118dd 100644
--- a/app/posts/[slug]/page.tsx
+++ b/app/posts/[slug]/page.tsx
@@ -93,6 +93,7 @@ export default async function PostPage({ params }: { params: Promise<{ slug: str
                         },
                         keepBackground: false,
                         lineNumbers: true,
+                        filterMetaString: (metaString: string | undefined) => (metaString || '') + ' showLineNumbers',
                         grid: true,
                         onVisitLine(node: LineElement) {
                           if (node.children.length === 0) {