diff --git a/vite-plugin-ruby/src/index.ts b/vite-plugin-ruby/src/index.ts
index d022bb85..48721424 100644
--- a/vite-plugin-ruby/src/index.ts
+++ b/vite-plugin-ruby/src/index.ts
@@ -46,7 +46,7 @@ function config (userConfig: UserConfig, env: ConfigEnv): UserConfig {
 
   // Detect if we're using rolldown
   // @ts-ignore - Vite plugin context provides meta information
-  const isUsingRolldown = this.meta && this.meta.rolldownVersion;
+  const isUsingRolldown = this && this.meta && this.meta.rolldownVersion;
   const optionsKey = isUsingRolldown ? "rolldownOptions" : "rollupOptions";
 
   const build = {