diff --git a/.changeset/empty-moose-grin.md b/.changeset/empty-moose-grin.md
new file mode 100644
index 000000000..b2b69f2ec
--- /dev/null
+++ b/.changeset/empty-moose-grin.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fix `getViteConfig` return type
diff --git a/packages/astro/config.d.ts b/packages/astro/config.d.ts
index 6e081a224..f117c6345 100644
--- a/packages/astro/config.d.ts
+++ b/packages/astro/config.d.ts
@@ -1,4 +1,5 @@
 type ViteUserConfig = import('vite').UserConfig;
+type ViteUserConfigFn = import('vite').UserConfigFn;
 type AstroUserConfig = import('./dist/@types/astro.js').AstroUserConfig;
 
 /**
@@ -10,4 +11,4 @@ export function defineConfig(config: AstroUserConfig): AstroUserConfig;
 /**
  * Use Astro to generate a fully resolved Vite config
  */
-export function getViteConfig(config: ViteUserConfig): ViteUserConfig;
+export function getViteConfig(config: ViteUserConfig): ViteUserConfigFn;