diff --git a/.changeset/twenty-monkeys-glow.md b/.changeset/twenty-monkeys-glow.md
new file mode 100644
index 000000000000..9a3d4d1a5eb4
--- /dev/null
+++ b/.changeset/twenty-monkeys-glow.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+Improve error message when prefetching fails
diff --git a/packages/kit/src/runtime/client/client.js b/packages/kit/src/runtime/client/client.js
index 837fdf389ada..70287c9106a1 100644
--- a/packages/kit/src/runtime/client/client.js
+++ b/packages/kit/src/runtime/client/client.js
@@ -199,7 +199,7 @@ export function create_client({ target, base, trailing_slash }) {
 		const intent = get_navigation_intent(url, false);
 
 		if (!intent) {
-			throw new Error('Attempted to prefetch a URL that does not belong to this app');
+			throw new Error(`Attempted to prefetch a URL that does not belong to this app: ${url}`);
 		}
 
 		load_cache = { id: intent.id, promise: load_route(intent) };