diff --git a/astro.config.mjs b/astro.config.mjs
index d2c210c..d91a40e 100755
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -53,4 +53,7 @@ export default defineConfig({
     },
     extendDefaultPlugins: true,
   },
+  build: {
+    format: config.site.trailing_slash ? 'directory' : 'file'
+  },
 });