diff --git a/.changeset/famous-boxes-tap.md b/.changeset/famous-boxes-tap.md
new file mode 100644
index 000000000000..fa5e045bb5a3
--- /dev/null
+++ b/.changeset/famous-boxes-tap.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+prevent duplicate module ids by disabling optimizeDeps for @sveltejs/kit
diff --git a/packages/kit/src/vite/build/utils.js b/packages/kit/src/vite/build/utils.js
index 14cd04a368f1..f0c3a2c21e16 100644
--- a/packages/kit/src/vite/build/utils.js
+++ b/packages/kit/src/vite/build/utils.js
@@ -123,6 +123,9 @@ export function get_default_build_config({ config, input, ssr, outDir }) {
 		resolve: {
 			alias: get_aliases(config.kit)
 		},
+		optimizeDeps: {
+			exclude: ['@sveltejs/kit']
+		},
 		ssr: {
 			noExternal: ['@sveltejs/kit']
 		},
diff --git a/packages/kit/src/vite/index.js b/packages/kit/src/vite/index.js
index 33a8f324b065..4f4471d952c0 100644
--- a/packages/kit/src/vite/index.js
+++ b/packages/kit/src/vite/index.js
@@ -273,6 +273,9 @@ function kit() {
 					// under different IDs, which breaks a bunch of stuff
 					// https://github.com/vitejs/vite/pull/9296
 					external: ['@sveltejs/kit']
+				},
+				optimizeDeps: {
+					exclude: ['@sveltejs/kit']
 				}
 			};