diff --git a/tools/cli/src/webpack/index.ts b/tools/cli/src/webpack/index.ts
index e4ff37ca74..8755f314d9 100644
--- a/tools/cli/src/webpack/index.ts
+++ b/tools/cli/src/webpack/index.ts
@@ -42,8 +42,9 @@ const OptimizeOptionOptions: (
         compress: {
           unused: true,
         },
-        mangle: true,
-        keep_classnames: true,
+        mangle: {
+          keep_classnames: true,
+        },
       },
     }),
   ],