diff --git a/examples/with-markdoc/tsconfig.json b/examples/with-markdoc/tsconfig.json
index d78f81ec4..e51e06270 100644
--- a/examples/with-markdoc/tsconfig.json
+++ b/examples/with-markdoc/tsconfig.json
@@ -1,3 +1,6 @@
 {
-  "extends": "astro/tsconfigs/base"
+  "extends": "astro/tsconfigs/base",
+  "compilerOptions": {
+    "strictNullChecks": true
+  }
 }