diff --git a/packages/plugin-vue/src/index.ts b/packages/plugin-vue/src/index.ts
index 6bc0db06fe2b10..3146802911e73d 100644
--- a/packages/plugin-vue/src/index.ts
+++ b/packages/plugin-vue/src/index.ts
@@ -124,7 +124,9 @@ export default function vuePlugin(rawOptions: Options = {}): Plugin {
           __VUE_PROD_DEVTOOLS__: config.define?.__VUE_PROD_DEVTOOLS__ ?? false
         },
         ssr: {
-          external: ['vue', '@vue/server-renderer']
+          external: config.legacy?.buildSsrCjsExternalHeuristics
+            ? ['vue', '@vue/server-renderer']
+            : []
         }
       }
     },