diff --git a/.changeset/lemon-otters-rest.md b/.changeset/lemon-otters-rest.md
new file mode 100644
index 000000000000..07cf72987bdf
--- /dev/null
+++ b/.changeset/lemon-otters-rest.md
@@ -0,0 +1,5 @@
+---
+"astro": patch
+---
+
+Fix a regression where the flag `experimental.rewriting` was marked mandatory. Is is now optional.
diff --git a/packages/astro/src/@types/astro.ts b/packages/astro/src/@types/astro.ts
index 74619cf7bf18..c745287e9e83 100644
--- a/packages/astro/src/@types/astro.ts
+++ b/packages/astro/src/@types/astro.ts
@@ -2107,7 +2107,7 @@ export interface AstroUserConfig {
 		 *
 		 * For a complete overview, and to give feedback on this experimental API, see the [Rerouting RFC](https://github.com/withastro/roadmap/blob/feat/reroute/proposals/0047-rerouting.md).
 		 */
-		rewriting: boolean;
+		rewriting?: boolean;
 	};
 }