diff --git a/examples/cms-datocms/pages/posts/[slug].js b/examples/cms-datocms/pages/posts/[slug].js
index bcfa6683eec7ee0..d00288b803ee2ea 100644
--- a/examples/cms-datocms/pages/posts/[slug].js
+++ b/examples/cms-datocms/pages/posts/[slug].js
@@ -50,7 +50,7 @@ export default function Post({ post, morePosts, preview }) {
   )
 }
 
-export async function getStaticProps({ params, preview }) {
+export async function getStaticProps({ params, preview = null }) {
   const data = await getPostAndMorePosts(params.slug, preview)
   const content = await markdownToHtml(data?.post?.content || '')