diff --git a/scripts/build-plugins/legacy-build.js b/scripts/build-plugins/legacy-build.js
index 3d069d4d..e1a2e1df 100644
--- a/scripts/build-plugins/legacy-build.js
+++ b/scripts/build-plugins/legacy-build.js
@@ -92,6 +92,7 @@ async function buildLegacyChunk(root, chunkName, code) {
             ]
         ]
     });
+    babelPlugin.enforce = "post";
     const bundle = await build({
         root,
         configFile: false,