diff --git a/lib/builder/generator.js b/lib/builder/generator.js
index 71a8986d55..3afd1cb79a 100644
--- a/lib/builder/generator.js
+++ b/lib/builder/generator.js
@@ -74,7 +74,7 @@ export default class Generator extends Tapable {
     }
 
     const indexPath = join(this.distPath, 'index.html')
-    if (existsSync(indexPath) {
+    if (existsSync(indexPath)) {
       // Copy /index.html to /200.html for surge SPA
       // https://surge.sh/help/adding-a-200-page-for-client-side-routing
       const _200Path = join(this.distPath, '200.html')