diff --git a/packages/schema/src/config/common.ts b/packages/schema/src/config/common.ts
index ad8e5f20b0..d28ea61d2e 100644
--- a/packages/schema/src/config/common.ts
+++ b/packages/schema/src/config/common.ts
@@ -1,7 +1,7 @@
 import { existsSync } from 'node:fs'
 import { readdir } from 'node:fs/promises'
 import { defineUntypedSchema } from 'untyped'
-import { basename, relative, resolve } from 'pathe'
+import { basename, join, relative, resolve } from 'pathe'
 import { isDebug, isDevelopment, isTest } from 'std-env'
 import { defu } from 'defu'
 import { findWorkspaceDir } from 'pkg-types'
@@ -156,9 +156,12 @@ export default defineUntypedSchema({
    */
   serverDir: {
     $resolve: async (val: string | undefined, get): Promise<string> => {
-      const isV4 = ((await get('future') as Record<string, unknown>).compatibilityVersion === 4)
-
-      return resolve(isV4 ? await get('rootDir') as string : await get('srcDir') as string, val ?? 'server')
+      if (val) {
+        const rootDir = await get('rootDir') as string
+        return resolve(rootDir, val)
+      }
+      const isV4 = (await get('future') as Record<string, unknown>).compatibilityVersion === 4
+      return join(isV4 ? await get('rootDir') as string : await get('srcDir') as string, 'server')
     },
   },