diff --git a/.changeset/spotty-camels-joke.md b/.changeset/spotty-camels-joke.md
new file mode 100644
index 0000000000..a924e12ccf
--- /dev/null
+++ b/.changeset/spotty-camels-joke.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Adds the missing export for accessing the `getFallback()` function of the client site router.
diff --git a/packages/astro/src/transitions/router.ts b/packages/astro/src/transitions/router.ts
index 0f3d912099..29029cefb8 100644
--- a/packages/astro/src/transitions/router.ts
+++ b/packages/astro/src/transitions/router.ts
@@ -132,7 +132,7 @@ async function fetchHTML(
 	}
 }
 
-function getFallback(): Fallback {
+export function getFallback(): Fallback {
 	const el = document.querySelector('[name="astro-view-transitions-fallback"]');
 	if (el) {
 		return el.getAttribute('content') as Fallback;