diff --git a/.changeset/perfect-walls-mix.md b/.changeset/perfect-walls-mix.md
new file mode 100644
index 000000000000..057c3ef3bd91
--- /dev/null
+++ b/.changeset/perfect-walls-mix.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+chore: fix import path to app script on windows
diff --git a/packages/kit/src/exports/vite/dev/index.js b/packages/kit/src/exports/vite/dev/index.js
index e130e77a01b3..b77c163d9aca 100644
--- a/packages/kit/src/exports/vite/dev/index.js
+++ b/packages/kit/src/exports/vite/dev/index.js
@@ -116,7 +116,7 @@ export async function dev(vite, vite_config, svelte_config) {
 			_: {
 				client: {
 					start: `${runtime_base}/client/start.js`,
-					app: `${svelte_config.kit.outDir}/generated/client/app.js`,
+					app: `${to_fs(svelte_config.kit.outDir)}/generated/client/app.js`,
 					imports: [],
 					stylesheets: [],
 					fonts: []