diff --git a/next.config.ts b/next.config.ts
index 2b68a65..fefdec6 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -27,7 +27,6 @@ const withMDX = createMDX({
         theme: { light: 'github-light', dark: 'github-dark-dimmed' },
         keepBackground: false,
         lineNumbers: true,
-        filterMetaString: (metaString: string | undefined) => (metaString || '') + ' showLineNumbers',
         grid: true,
         transformers: [
           transformerCopyButton({ visibility: 'hover', feedbackDuration: 2500 }),