diff --git a/guide/age-of-four/vitest.config.ts b/guide/age-of-four/vitest.config.ts
index b9036581..4e52c691 100644
--- a/guide/age-of-four/vitest.config.ts
+++ b/guide/age-of-four/vitest.config.ts
@@ -10,6 +10,8 @@ export default defineConfig({
     alias: {
       '@': path.resolve(__dirname, './src'),
       '@data': path.resolve(__dirname, '../themes/fantasy/data'),
+      '@magic-civ/guide-engine': path.resolve(__dirname, '../engine/src'),
+      '@magic-civ/engine-ts': path.resolve(__dirname, '../../packages/engine-ts/src/index.ts'),
     },
   },
 })