diff --git a/.changeset/tender-kiwis-happen.md b/.changeset/tender-kiwis-happen.md
new file mode 100644
index 000000000000..a7c5db35b6f5
--- /dev/null
+++ b/.changeset/tender-kiwis-happen.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+[fix] correctly strip data suffix at root page
diff --git a/packages/kit/src/runtime/server/index.js b/packages/kit/src/runtime/server/index.js
index 007e029d6b48..3158bd2495b0 100644
--- a/packages/kit/src/runtime/server/index.js
+++ b/packages/kit/src/runtime/server/index.js
@@ -63,7 +63,7 @@ export async function respond(request, options, state) {
 	}
 
 	const is_data_request = has_data_suffix(decoded);
-	if (is_data_request) decoded = strip_data_suffix(decoded);
+	if (is_data_request) decoded = strip_data_suffix(decoded) || '/';
 
 	if (!state.prerendering?.fallback) {
 		const matchers = await options.manifest._.matchers();