diff --git a/packages/tuono/src/build/types.ts b/packages/tuono/src/build/types.ts
index a4187588..8733abf2 100644
--- a/packages/tuono/src/build/types.ts
+++ b/packages/tuono/src/build/types.ts
@@ -1,5 +1,5 @@
-import type { TuonoConfig } from '../config'
+import type { TuonoConfig, TuonoConfigServer } from '../config'
 
 export interface InternalTuonoConfig extends Omit<TuonoConfig, 'server'> {
-  server: Required<NonNullable<TuonoConfig['server']>>
+  server: TuonoConfigServer
 }
diff --git a/packages/tuono/src/config/index.ts b/packages/tuono/src/config/index.ts
index b7c6b20d..61f6efe8 100644
--- a/packages/tuono/src/config/index.ts
+++ b/packages/tuono/src/config/index.ts
@@ -1 +1 @@
-export type { TuonoConfig } from './types'
+export type { TuonoConfig, TuonoConfigServer } from './types'
diff --git a/packages/tuono/src/config/types.ts b/packages/tuono/src/config/types.ts
index 43941f83..d5e62079 100644
--- a/packages/tuono/src/config/types.ts
+++ b/packages/tuono/src/config/types.ts
@@ -5,15 +5,17 @@ import type {
   CSSOptions,
 } from 'vite'
 
+export interface TuonoConfigServer {
+  host: string
+  origin: string | null
+  port: number
+}
+
 /**
  * @see http://tuono.dev/documentation/configuration
  */
 export interface TuonoConfig {
-  server?: {
-    host?: string
-    origin?: string | null
-    port?: number
-  }
+  server?: Partial<TuonoConfigServer>
   vite?: {
     alias?: AliasOptions
     css?: CSSOptions